66456165523 has 16 divisors (see below), whose sum is σ = 75782822400. Its totient is φ = 57686284480.

The previous prime is 66456165509. The next prime is 66456165527. The reversal of 66456165523 is 32556165466.

It is not a de Polignac number, because 66456165523 - 2²⁵ = 66422611091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66456165527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86863 + ... + 374776.

It is an arithmetic number, because the mean of its divisors is an integer number (4736426400).

Almost surely, 2^66456165523 is an apocalyptic number.

66456165523 is a deficient number, since it is larger than the sum of its proper divisors (9326656877).

66456165523 is a wasteful number, since it uses less digits than its factorization.

66456165523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462242.

The product of its digits is 3888000, while the sum is 49.

The spelling of 66456165523 in words is "sixty-six billion, four hundred fifty-six million, one hundred sixty-five thousand, five hundred twenty-three".