56166381 has 12 divisors (see below), whose sum is σ = 81750240. Its totient is φ = 37157640.

The previous prime is 56166373. The next prime is 56166427. The reversal of 56166381 is 18366165.

It is a happy number.

56166381 is a `hidden beast` number, since 5 + 6 + 16 + 638 + 1 = 666.

It is not a de Polignac number, because 56166381 - 2³ = 56166373 is a prime.

It is a super-2 number, since 2×56166381² = 6309324709274322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56166581) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22641 + ... + 24998.

It is an arithmetic number, because the mean of its divisors is an integer number (6812520).

Almost surely, 2^56166381 is an apocalyptic number.

It is an amenable number.

56166381 is a deficient number, since it is larger than the sum of its proper divisors (25583859).

56166381 is a wasteful number, since it uses less digits than its factorization.

56166381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47776 (or 47773 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 56166381 is about 7494.4233267143. The cubic root of 56166381 is about 382.9647612142.

The spelling of 56166381 in words is "fifty-six million, one hundred sixty-six thousand, three hundred eighty-one".