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18514772761 = 1360692
BaseRepresentation
bin10001001111100100…
…010000001100011001
31202210022210220111111
4101033210100030121
5300404240212021
612301111500321
71223545654222
oct211744201431
952708726444
1018514772761
1179411198a1
1237086876a1
131990a88754
14c78d4a249
1573568d8e1
hex44f910319

18514772761 has 3 divisors (see below), whose sum is σ = 18514908831. Its totient is φ = 18514636692.

The previous prime is 18514772719. The next prime is 18514772767. The reversal of 18514772761 is 16727741581.

The square root of 18514772761 is 136069.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 8293562761 + 10221210000 = 91069^2 + 101100^2 .

It is not a de Polignac number, because 18514772761 - 215 = 18514739993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18514772767) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 68035 + ... + 204103.

It is an arithmetic number, because the mean of its divisors is an integer number (6171636277).

Almost surely, 218514772761 is an apocalyptic number.

18514772761 is the 136069-th square number.

18514772761 is the 68035-th centered octagonal number.

It is an amenable number.

18514772761 is a deficient number, since it is larger than the sum of its proper divisors (136070).

18514772761 is an frugal number, since it uses more digits than its factorization.

18514772761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272138 (or 136069 counting only the distinct ones).

The product of its digits is 658560, while the sum is 49.

Multiplying 18514772761 by its sum of digits (49), we get a square (907223865289 = 9524832).

The spelling of 18514772761 in words is "eighteen billion, five hundred fourteen million, seven hundred seventy-two thousand, seven hundred sixty-one".

Divisors: 1 136069 18514772761