66761564328 has 48 divisors (see below), whose sum is σ = 181532988000. Its totient is φ = 22165188000.

The previous prime is 66761564269. The next prime is 66761564341. The reversal of 66761564328 is 82346516766.

66761564328 is a `hidden beast` number, since 6 + 6 + 76 + 1 + 564 + 3 + 2 + 8 = 666.

It is a hoax number, since the sum of its digits (54) 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 in 11 ways as a sum of consecutive naturals, for example, 1829028 + ... + 1865171.

It is an arithmetic number, because the mean of its divisors is an integer number (3781937250).

Almost surely, 2^66761564328 is an apocalyptic number.

It is an amenable number.

66761564328 is an abundant number, since it is smaller than the sum of its proper divisors (114771423672).

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

66761564328 is a wasteful number, since it uses less digits than its factorization.

66761564328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3694462 (or 3694455 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 54.

The spelling of 66761564328 in words is "sixty-six billion, seven hundred sixty-one million, five hundred sixty-four thousand, three hundred twenty-eight".