13656161881 has 4 divisors (see below), whose sum is σ = 14096683264. Its totient is φ = 13215640500.

The previous prime is 13656161861. The next prime is 13656161899. The reversal of 13656161881 is 18816165631.

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 not a de Polignac number, because 13656161881 - 2⁹ = 13656161369 is a prime.

It is a super-2 number, since 2×13656161881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13656161801) 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, 220260645 + ... + 220260706.

It is an arithmetic number, because the mean of its divisors is an integer number (3524170816).

Almost surely, 2^13656161881 is an apocalyptic number.

It is an amenable number.

13656161881 is a deficient number, since it is larger than the sum of its proper divisors (440521383).

13656161881 is an equidigital number, since it uses as much as digits as its factorization.

13656161881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440521382.

The product of its digits is 207360, while the sum is 46.

The spelling of 13656161881 in words is "thirteen billion, six hundred fifty-six million, one hundred sixty-one thousand, eight hundred eighty-one".