13664256534 has 12 divisors (see below), whose sum is σ = 29605889196. Its totient is φ = 4554752172.

The previous prime is 13664256523. The next prime is 13664256559. The reversal of 13664256534 is 43565246631.

13664256534 is a `hidden beast` number, since 1 + 3 + 6 + 64 + 2 + 56 + 534 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 13664256534.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 379562664 + ... + 379562699.

It is an arithmetic number, because the mean of its divisors is an integer number (2467157433).

Almost surely, 2^13664256534 is an apocalyptic number.

13664256534 is an abundant number, since it is smaller than the sum of its proper divisors (15941632662).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13664256534 is a wasteful number, since it uses less digits than its factorization.

13664256534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759125371 (or 759125368 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 45.

The spelling of 13664256534 in words is "thirteen billion, six hundred sixty-four million, two hundred fifty-six thousand, five hundred thirty-four".