56156661 has 48 divisors (see below), whose sum is σ = 95404608. Its totient is φ = 31449600.

The previous prime is 56156657. The next prime is 56156663. The reversal of 56156661 is 16665165.

It is not a de Polignac number, because 56156661 - 2² = 56156657 is a prime.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56156663) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 102390 + ... + 102936.

It is an arithmetic number, because the mean of its divisors is an integer number (1987596).

Almost surely, 2^56156661 is an apocalyptic number.

56156661 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

56156661 is a deficient number, since it is larger than the sum of its proper divisors (39247947).

56156661 is a wasteful number, since it uses less digits than its factorization.

56156661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642 (or 639 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 56156661 is about 7493.7748164727. The cubic root of 56156661 is about 382.9426683290.

The spelling of 56156661 in words is "fifty-six million, one hundred fifty-six thousand, six hundred sixty-one".