66321930990 has 32 divisors (see below), whose sum is σ = 181911582720. Its totient is φ = 15159298464.

The previous prime is 66321930971. The next prime is 66321931007. The reversal of 66321930990 is 9903912366.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157909150 + ... + 157909569.

It is an arithmetic number, because the mean of its divisors is an integer number (5684736960).

Almost surely, 2^66321930990 is an apocalyptic number.

66321930990 is an abundant number, since it is smaller than the sum of its proper divisors (115589651730).

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

66321930990 is a wasteful number, since it uses less digits than its factorization.

66321930990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315818736.

The product of its (nonzero) digits is 472392, while the sum is 48.

The spelling of 66321930990 in words is "sixty-six billion, three hundred twenty-one million, nine hundred thirty thousand, nine hundred ninety".