66444600264 has 32 divisors (see below), whose sum is σ = 189841715520. Its totient is φ = 18984171456.

The previous prime is 66444600241. The next prime is 66444600269. The reversal of 66444600264 is 46200644466.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (66444600269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197751619 + ... + 197751954.

It is an arithmetic number, because the mean of its divisors is an integer number (5932553610).

Almost surely, 2^66444600264 is an apocalyptic number.

It is an amenable number.

66444600264 is an abundant number, since it is smaller than the sum of its proper divisors (123397115256).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66444600264 is a wasteful number, since it uses less digits than its factorization.

66444600264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395503589 (or 395503585 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 42.

The spelling of 66444600264 in words is "sixty-six billion, four hundred forty-four million, six hundred thousand, two hundred sixty-four".