13656864477 has 4 divisors (see below), whose sum is σ = 18209152640. Its totient is φ = 9104576316.

The previous prime is 13656864467. The next prime is 13656864503. The reversal of 13656864477 is 77446865631.

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 not a de Polignac number, because 13656864477 - 2³⁰ = 12583122653 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 (13656864427) 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, 2276144077 + ... + 2276144082.

It is an arithmetic number, because the mean of its divisors is an integer number (4552288160).

Almost surely, 2^13656864477 is an apocalyptic number.

It is an amenable number.

13656864477 is a deficient number, since it is larger than the sum of its proper divisors (4552288163).

13656864477 is an equidigital number, since it uses as much as digits as its factorization.

13656864477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4552288162.

The product of its digits is 20321280, while the sum is 57.

The spelling of 13656864477 in words is "thirteen billion, six hundred fifty-six million, eight hundred sixty-four thousand, four hundred seventy-seven".