66390605164 has 24 divisors (see below), whose sum is σ = 125382015360. Its totient is φ = 30577835904.

The previous prime is 66390605161. The next prime is 66390605179. The reversal of 66390605164 is 46150609366.

It is not an unprimeable number, because it can be changed into a prime (66390605161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1307809 + ... + 1357624.

It is an arithmetic number, because the mean of its divisors is an integer number (5224250640).

Almost surely, 2^66390605164 is an apocalyptic number.

It is an amenable number.

66390605164 is a deficient number, since it is larger than the sum of its proper divisors (58991410196).

66390605164 is a wasteful number, since it uses less digits than its factorization.

66390605164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2665929 (or 2665927 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 46.

The spelling of 66390605164 in words is "sixty-six billion, three hundred ninety million, six hundred five thousand, one hundred sixty-four".