66501957576 has 32 divisors (see below), whose sum is σ = 166562236800. Its totient is φ = 22126340160.

The previous prime is 66501957559. The next prime is 66501957607. The reversal of 66501957576 is 67575910566.

It is a super-2 number, since 2×66501957576² (a number of 22 digits) contains 22 as substring.

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, 2547936 + ... + 2573903.

It is an arithmetic number, because the mean of its divisors is an integer number (5205069900).

Almost surely, 2^66501957576 is an apocalyptic number.

It is an amenable number.

66501957576 is an abundant number, since it is smaller than the sum of its proper divisors (100060279224).

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

66501957576 is a wasteful number, since it uses less digits than its factorization.

66501957576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5122389 (or 5122385 counting only the distinct ones).

The product of its (nonzero) digits is 11907000, while the sum is 57.

The spelling of 66501957576 in words is "sixty-six billion, five hundred one million, nine hundred fifty-seven thousand, five hundred seventy-six".