56165390666 has 32 divisors (see below), whose sum is σ = 106816872960. Its totient is φ = 21511724400.

The previous prime is 56165390663. The next prime is 56165390669. The reversal of 56165390666 is 66609356165.

It is an interprime number because it is at equal distance from previous prime (56165390663) and next prime (56165390669).

It is a super-2 number, since 2×56165390666² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (56165390663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3081680 + ... + 3099851.

It is an arithmetic number, because the mean of its divisors is an integer number (3338027280).

Almost surely, 2^56165390666 is an apocalyptic number.

56165390666 is a deficient number, since it is larger than the sum of its proper divisors (50651482294).

56165390666 is a wasteful number, since it uses less digits than its factorization.

56165390666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6181610.

The product of its (nonzero) digits is 5248800, while the sum is 53.

The spelling of 56165390666 in words is "fifty-six billion, one hundred sixty-five million, three hundred ninety thousand, six hundred sixty-six".