66155000656 has 20 divisors (see below), whose sum is σ = 128220265972. Its totient is φ = 33065899776.

The previous prime is 66155000647. The next prime is 66155000663. The reversal of 66155000656 is 65600055166.

66155000656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 60164240656 + 5990760000 = 245284^2 + 77400^2 .

It is a super-2 number, since 2×66155000656² (a number of 22 digits) contains 22 as substring.

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, 677895 + ... + 769318.

Almost surely, 2^66155000656 is an apocalyptic number.

It is an amenable number.

66155000656 is a deficient number, since it is larger than the sum of its proper divisors (62065265316).

66155000656 is a wasteful number, since it uses less digits than its factorization.

66155000656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1450078 (or 1450072 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 40.

The spelling of 66155000656 in words is "sixty-six billion, one hundred fifty-five million, six hundred fifty-six", and thus it is an aban number.