56645561 has 8 divisors (see below), whose sum is σ = 64784064. Its totient is φ = 48518640.

The previous prime is 56645543. The next prime is 56645599. The reversal of 56645561 is 16554665.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 56645561 - 2¹⁸ = 56383417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56645521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14891 + ... + 18303.

It is an arithmetic number, because the mean of its divisors is an integer number (8098008).

Almost surely, 2^56645561 is an apocalyptic number.

It is an amenable number.

56645561 is a deficient number, since it is larger than the sum of its proper divisors (8138503).

56645561 is a wasteful number, since it uses less digits than its factorization.

56645561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5791.

The product of its digits is 108000, while the sum is 38.

The square root of 56645561 is about 7526.3245345919. The cubic root of 56645561 is about 384.0507587163.

The spelling of 56645561 in words is "fifty-six million, six hundred forty-five thousand, five hundred sixty-one".