136621605656 has 16 divisors (see below), whose sum is σ = 269647906200. Its totient is φ = 64715497344.

The previous prime is 136621605647. The next prime is 136621605727. The reversal of 136621605656 is 656506126631.

It is a self number, because there is not a number n which added to its sum of digits gives 136621605656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 449413025 + ... + 449413328.

Almost surely, 2^136621605656 is an apocalyptic number.

It is an amenable number.

136621605656 is a deficient number, since it is larger than the sum of its proper divisors (133026300544).

136621605656 is a wasteful number, since it uses less digits than its factorization.

136621605656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898826378 (or 898826374 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 47.

The spelling of 136621605656 in words is "one hundred thirty-six billion, six hundred twenty-one million, six hundred five thousand, six hundred fifty-six".