66172085904 has 40 divisors (see below), whose sum is σ = 170967360960. Its totient is φ = 22054419328.

The previous prime is 66172085893. The next prime is 66172085929. The reversal of 66172085904 is 40958027166.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 287749 + ... + 463835.

It is an arithmetic number, because the mean of its divisors is an integer number (4274184024).

Almost surely, 2^66172085904 is an apocalyptic number.

It is an amenable number.

66172085904 is an abundant number, since it is smaller than the sum of its proper divisors (104795275056).

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

66172085904 is a wasteful number, since it uses less digits than its factorization.

66172085904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183927 (or 183921 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 48.

The spelling of 66172085904 in words is "sixty-six billion, one hundred seventy-two million, eighty-five thousand, nine hundred four".