66166201584 has 60 divisors (see below), whose sum is σ = 211626822576. Its totient is φ = 18904628736.

The previous prime is 66166201573. The next prime is 66166201601. The reversal of 66166201584 is 48510266166.

66166201584 is a `hidden beast` number, since 6 + 6 + 1 + 6 + 62 + 0 + 1 + 584 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32819529 + ... + 32821544.

Almost surely, 2^66166201584 is an apocalyptic number.

It is an amenable number.

66166201584 is an abundant number, since it is smaller than the sum of its proper divisors (145460620992).

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

66166201584 is a wasteful number, since it uses less digits than its factorization.

66166201584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65641094 (or 65641085 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 66166201584 in words is "sixty-six billion, one hundred sixty-six million, two hundred one thousand, five hundred eighty-four".