66572623664 has 20 divisors (see below), whose sum is σ = 128988482304. Its totient is φ = 33285273408.

The previous prime is 66572623661. The next prime is 66572623687. The reversal of 66572623664 is 46632627566.

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (66572623661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 887594 + ... + 959670.

Almost surely, 2^66572623664 is an apocalyptic number.

It is an amenable number.

66572623664 is a deficient number, since it is larger than the sum of its proper divisors (62415858640).

66572623664 is a wasteful number, since it uses less digits than its factorization.

66572623664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129812 (or 129806 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 53.

The spelling of 66572623664 in words is "sixty-six billion, five hundred seventy-two million, six hundred twenty-three thousand, six hundred sixty-four".