66172552172 has 24 divisors (see below), whose sum is σ = 118955587296. Its totient is φ = 32185600128.

The previous prime is 66172552153. The next prime is 66172552183. The reversal of 66172552172 is 27125527166.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

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, 742688 + ... + 827000.

It is an arithmetic number, because the mean of its divisors is an integer number (4956482804).

Almost surely, 2^66172552172 is an apocalyptic number.

It is an amenable number.

66172552172 is a deficient number, since it is larger than the sum of its proper divisors (52783035124).

66172552172 is a wasteful number, since it uses less digits than its factorization.

66172552172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89657 (or 89655 counting only the distinct ones).

The product of its digits is 352800, while the sum is 44.

The spelling of 66172552172 in words is "sixty-six billion, one hundred seventy-two million, five hundred fifty-two thousand, one hundred seventy-two".