66166116864 has 40 divisors (see below), whose sum is σ = 176270674800. Its totient is φ = 22055371776.

The previous prime is 66166116859. The next prime is 66166116911. The reversal of 66166116864 is 46861166166.

66166116864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21536914 + ... + 21539985.

It is an arithmetic number, because the mean of its divisors is an integer number (4406766870).

Almost surely, 2^66166116864 is an apocalyptic number.

66166116864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

66166116864 is an abundant number, since it is smaller than the sum of its proper divisors (110104557936).

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

66166116864 is an equidigital number, since it uses as much as digits as its factorization.

66166116864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43076920 (or 43076904 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 51.

The spelling of 66166116864 in words is "sixty-six billion, one hundred sixty-six million, one hundred sixteen thousand, eight hundred sixty-four".