66100506564 has 72 divisors (see below), whose sum is σ = 170964537408. Its totient is φ = 19835763200.

The previous prime is 66100506559. The next prime is 66100506583. The reversal of 66100506564 is 46560500166.

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, 334587 + ... + 494114.

It is an arithmetic number, because the mean of its divisors is an integer number (2374507464).

Almost surely, 2^66100506564 is an apocalyptic number.

It is an amenable number.

66100506564 is an abundant number, since it is smaller than the sum of its proper divisors (104864030844).

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

66100506564 is a wasteful number, since it uses less digits than its factorization.

66100506564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828765 (or 828746 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

The spelling of 66100506564 in words is "sixty-six billion, one hundred million, five hundred six thousand, five hundred sixty-four".