66303729928 has 8 divisors (see below), whose sum is σ = 124319493630. Its totient is φ = 33151864960.

The previous prime is 66303729883. The next prime is 66303729977. The reversal of 66303729928 is 82992730366.

It can be written as a sum of positive squares in only one way, i.e., 66296980324 + 6749604 = 257482^2 + 2598^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4143983113 + ... + 4143983128.

Almost surely, 2^66303729928 is an apocalyptic number.

It is an amenable number.

66303729928 is a deficient number, since it is larger than the sum of its proper divisors (58015763702).

66303729928 is a wasteful number, since it uses less digits than its factorization.

66303729928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8287966247 (or 8287966243 counting only the distinct ones).

The product of its (nonzero) digits is 5878656, while the sum is 55.

The spelling of 66303729928 in words is "sixty-six billion, three hundred three million, seven hundred twenty-nine thousand, nine hundred twenty-eight".