66173150556 has 72 divisors (see below), whose sum is σ = 183670184880. Its totient is φ = 20760198912.

The previous prime is 66173150503. The next prime is 66173150579. The reversal of 66173150556 is 65505137166.

66173150556 is a `hidden beast` number, since 6 + 6 + 17 + 31 + 50 + 556 = 666.

66173150556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1985811 + ... + 2018858.

It is an arithmetic number, because the mean of its divisors is an integer number (2550974790).

Almost surely, 2^66173150556 is an apocalyptic number.

It is an amenable number.

66173150556 is an abundant number, since it is smaller than the sum of its proper divisors (117497034324).

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

66173150556 is a wasteful number, since it uses less digits than its factorization.

66173150556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4004705 (or 4004691 counting only the distinct ones).

The product of its (nonzero) digits is 567000, while the sum is 45.

The spelling of 66173150556 in words is "sixty-six billion, one hundred seventy-three million, one hundred fifty thousand, five hundred fifty-six".