56666172 has 24 divisors (see below), whose sum is σ = 132523216. Its totient is φ = 18845568.

The previous prime is 56666149. The next prime is 56666173. The reversal of 56666172 is 27166665.

It is a super-2 number, since 2×56666172² = 6422110098267168, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 56666172.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56666173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318 + ... + 10650.

Almost surely, 2^56666172 is an apocalyptic number.

It is an amenable number.

56666172 is an abundant number, since it is smaller than the sum of its proper divisors (75857044).

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

56666172 is a wasteful number, since it uses less digits than its factorization.

56666172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10797 (or 10795 counting only the distinct ones).

The product of its digits is 90720, while the sum is 39.

The square root of 56666172 is about 7527.6936707069. The cubic root of 56666172 is about 384.0973331826.

The spelling of 56666172 in words is "fifty-six million, six hundred sixty-six thousand, one hundred seventy-two".