66157731052 has 24 divisors (see below), whose sum is σ = 132383390720. Its totient is φ = 28338757200.

The previous prime is 66157731043. The next prime is 66157731071. The reversal of 66157731052 is 25013775166.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 550902 + ... + 660157.

Almost surely, 2^66157731052 is an apocalyptic number.

It is an amenable number.

66157731052 is an abundant number, since it is smaller than the sum of its proper divisors (66225659668).

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

66157731052 is a wasteful number, since it uses less digits than its factorization.

66157731052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213021 (or 1213019 counting only the distinct ones).

The product of its (nonzero) digits is 264600, while the sum is 43.

The spelling of 66157731052 in words is "sixty-six billion, one hundred fifty-seven million, seven hundred thirty-one thousand, fifty-two".