56161666515 has 32 divisors (see below), whose sum is σ = 94835220480. Its totient is φ = 28302276096.

The previous prime is 56161666513. The next prime is 56161666571. The reversal of 56161666515 is 51566616165.

It is not a de Polignac number, because 56161666515 - 2¹ = 56161666513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56161666513) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 148102 + ... + 366411.

It is an arithmetic number, because the mean of its divisors is an integer number (2963600640).

Almost surely, 2^56161666515 is an apocalyptic number.

56161666515 is a deficient number, since it is larger than the sum of its proper divisors (38673553965).

56161666515 is a wasteful number, since it uses less digits than its factorization.

56161666515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514923.

The product of its digits is 972000, while the sum is 48.

The spelling of 56161666515 in words is "fifty-six billion, one hundred sixty-one million, six hundred sixty-six thousand, five hundred fifteen".