66101665660 has 48 divisors (see below), whose sum is σ = 139975516800. Its totient is φ = 26219916800.

The previous prime is 66101665559. The next prime is 66101665681. The reversal of 66101665660 is 6656610166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1820685 + ... + 1856635.

It is an arithmetic number, because the mean of its divisors is an integer number (2916156600).

Almost surely, 2^66101665660 is an apocalyptic number.

It is an amenable number.

66101665660 is an abundant number, since it is smaller than the sum of its proper divisors (73873851140).

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

66101665660 is a wasteful number, since it uses less digits than its factorization.

66101665660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36726 (or 36724 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 43.

The spelling of 66101665660 in words is "sixty-six billion, one hundred one million, six hundred sixty-five thousand, six hundred sixty".