66444700864 has 28 divisors (see below), whose sum is σ = 131860594800. Its totient is φ = 33219984128.

The previous prime is 66444700837. The next prime is 66444700871. The reversal of 66444700864 is 46800744466.

66444700864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1178142 + ... + 1233250.

Almost surely, 2^66444700864 is an apocalyptic number.

66444700864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

66444700864 is a deficient number, since it is larger than the sum of its proper divisors (65415893936).

66444700864 is a wasteful number, since it uses less digits than its factorization.

66444700864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73960 (or 73950 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 49.

The spelling of 66444700864 in words is "sixty-six billion, four hundred forty-four million, seven hundred thousand, eight hundred sixty-four".