13656617655 has 32 divisors (see below), whose sum is σ = 22819124736. Its totient is φ = 6961198464.

The previous prime is 13656617647. The next prime is 13656617657. The reversal of 13656617655 is 55671665631.

It is not a de Polignac number, because 13656617655 - 2³ = 13656617647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13656617598 and 13656617607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13656617657) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 427209 + ... + 458061.

It is an arithmetic number, because the mean of its divisors is an integer number (713097648).

Almost surely, 2^13656617655 is an apocalyptic number.

13656617655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13656617655 is a deficient number, since it is larger than the sum of its proper divisors (9162507081).

13656617655 is a wasteful number, since it uses less digits than its factorization.

13656617655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32167.

The product of its digits is 3402000, while the sum is 51.

The spelling of 13656617655 in words is "thirteen billion, six hundred fifty-six million, six hundred seventeen thousand, six hundred fifty-five".