13656831551 has 16 divisors (see below), whose sum is σ = 15245897760. Its totient is φ = 12127739520.

The previous prime is 13656831547. The next prime is 13656831553. The reversal of 13656831551 is 15513865631.

It is a cyclic number.

It is not a de Polignac number, because 13656831551 - 2² = 13656831547 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13656831553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82361 + ... + 184653.

It is an arithmetic number, because the mean of its divisors is an integer number (952868610).

Almost surely, 2^13656831551 is an apocalyptic number.

13656831551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13656831551 is a deficient number, since it is larger than the sum of its proper divisors (1589066209).

13656831551 is a wasteful number, since it uses less digits than its factorization.

13656831551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102586.

The product of its digits is 324000, while the sum is 44.

The spelling of 13656831551 in words is "thirteen billion, six hundred fifty-six million, eight hundred thirty-one thousand, five hundred fifty-one".