66444008568 has 32 divisors (see below), whose sum is σ = 189840024960. Its totient is φ = 18984002400.

The previous prime is 66444008537. The next prime is 66444008611. The reversal of 66444008568 is 86580044466.

It is a self number, because there is not a number n which added to its sum of digits gives 66444008568.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197749858 + ... + 197750193.

It is an arithmetic number, because the mean of its divisors is an integer number (5932500780).

Almost surely, 2^66444008568 is an apocalyptic number.

It is an amenable number.

66444008568 is an abundant number, since it is smaller than the sum of its proper divisors (123396016392).

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

66444008568 is a wasteful number, since it uses less digits than its factorization.

66444008568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395500067 (or 395500063 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 51.

The spelling of 66444008568 in words is "sixty-six billion, four hundred forty-four million, eight thousand, five hundred sixty-eight".