56515661065 has 8 divisors (see below), whose sum is σ = 70767436608. Its totient is φ = 43246766640.

The previous prime is 56515661053. The next prime is 56515661077. The reversal of 56515661065 is 56016651565.

It is an interprime number because it is at equal distance from previous prime (56515661053) and next prime (56515661077).

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

It is not a de Polignac number, because 56515661065 - 2³⁵ = 22155922697 is a prime.

It is a super-2 number, since 2×56515661065² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245720151 + ... + 245720380.

It is an arithmetic number, because the mean of its divisors is an integer number (8845929576).

Almost surely, 2^56515661065 is an apocalyptic number.

It is an amenable number.

56515661065 is a deficient number, since it is larger than the sum of its proper divisors (14251775543).

56515661065 is a wasteful number, since it uses less digits than its factorization.

56515661065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491440559.

The product of its (nonzero) digits is 810000, while the sum is 46.

The spelling of 56515661065 in words is "fifty-six billion, five hundred fifteen million, six hundred sixty-one thousand, sixty-five".