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16868683537 = 31215404897
BaseRepresentation
bin11111011010111001…
…11010111100010001
31121112121101220120221
433231130322330101
5234021340333122
611425510233041
71135010305246
oct175534727421
947477356527
1016868683537
117176a28682
123329355781
13178aa36664
14b604995cd
1568add86c7
hex3ed73af11

16868683537 has 4 divisors (see below), whose sum is σ = 16874091556. Its totient is φ = 16863275520.

The previous prime is 16868683519. The next prime is 16868683541. The reversal of 16868683537 is 73538686861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 615238416 + 16253445121 = 24804^2 + 127489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-16868683537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16868683577) 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, 2699328 + ... + 2705569.

It is an arithmetic number, because the mean of its divisors is an integer number (4218522889).

Almost surely, 216868683537 is an apocalyptic number.

It is an amenable number.

16868683537 is a deficient number, since it is larger than the sum of its proper divisors (5408019).

16868683537 is an equidigital number, since it uses as much as digits as its factorization.

16868683537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5408018.

The product of its digits is 34836480, while the sum is 61.

The spelling of 16868683537 in words is "sixteen billion, eight hundred sixty-eight million, six hundred eighty-three thousand, five hundred thirty-seven".

Divisors: 1 3121 5404897 16868683537