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18384680624861 = 34220353724487
BaseRepresentation
bin1000010111000100001000…
…10110111010001011011101
32102002120002000002010200002
410023202010112322023131
54402203311214443421
6103033450005544045
73605151344621345
oct413420426721335
972076060063602
1018384680624861
115948998a1a341
12208b0a8415025
13a3488b61bca5
14477b75171d25
1521d363902b0b
hex10b8845ba2dd

18384680624861 has 4 divisors (see below), whose sum is σ = 18384734691552. Its totient is φ = 18384626558172.

The previous prime is 18384680624749. The next prime is 18384680624881. The reversal of 18384680624861 is 16842608648381.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-18384680624861 is a prime.

It is a super-2 number, since 2×183846806248612 (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18384680624881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26520041 + ... + 27204446.

It is an arithmetic number, because the mean of its divisors is an integer number (4596183672888).

Almost surely, 218384680624861 is an apocalyptic number.

It is an amenable number.

18384680624861 is a deficient number, since it is larger than the sum of its proper divisors (54066691).

18384680624861 is an equidigital number, since it uses as much as digits as its factorization.

18384680624861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54066690.

The product of its (nonzero) digits is 84934656, while the sum is 65.

The spelling of 18384680624861 in words is "eighteen trillion, three hundred eighty-four billion, six hundred eighty million, six hundred twenty-four thousand, eight hundred sixty-one".

Divisors: 1 342203 53724487 18384680624861