66313656 has 48 divisors (see below), whose sum is σ = 180025560. Its totient is φ = 22052160.

The previous prime is 66313603. The next prime is 66313673. The reversal of 66313656 is 65631366.

It is a happy number.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 66313656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40306 + ... + 41918.

Almost surely, 2^66313656 is an apocalyptic number.

It is an amenable number.

66313656 is an abundant number, since it is smaller than the sum of its proper divisors (113711904).

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

66313656 is a wasteful number, since it uses less digits than its factorization.

66313656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2196 (or 2189 counting only the distinct ones).

The product of its digits is 58320, while the sum is 36.

The square root of 66313656 is about 8143.3197161845. The cubic root of 66313656 is about 404.7631720103.

The spelling of 66313656 in words is "sixty-six million, three hundred thirteen thousand, six hundred fifty-six".