66456165531 has 32 divisors (see below), whose sum is σ = 102008083968. Its totient is φ = 37697425920.

The previous prime is 66456165527. The next prime is 66456165539. The reversal of 66456165531 is 13556165466.

It is not a de Polignac number, because 66456165531 - 2² = 66456165527 is a prime.

It is a super-2 number, since 2×66456165531² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66456165539) 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, 3004645 + ... + 3026681.

It is an arithmetic number, because the mean of its divisors is an integer number (3187752624).

Almost surely, 2^66456165531 is an apocalyptic number.

66456165531 is a deficient number, since it is larger than the sum of its proper divisors (35551918437).

66456165531 is a wasteful number, since it uses less digits than its factorization.

66456165531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23091.

The product of its digits is 1944000, while the sum is 48.

The spelling of 66456165531 in words is "sixty-six billion, four hundred fifty-six million, one hundred sixty-five thousand, five hundred thirty-one".