66666672793920 has 112 divisors (see below), whose sum is σ = 220869585590400. Its totient is φ = 17004832475136.

The previous prime is 66666672793859. The next prime is 66666672793921. The reversal of 66666672793920 is 2939727666666.

It is a super-2 number, since 2×66666672793920² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66666672793921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1509639895 + ... + 1509684054.

Almost surely, 2^{66666672793920} is an apocalyptic number.

66666672793920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66666672793920 is an abundant number, since it is smaller than the sum of its proper divisors (154202912796480).

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

66666672793920 is a wasteful number, since it uses less digits than its factorization.

66666672793920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3019323992 (or 3019323982 counting only the distinct ones).

The product of its (nonzero) digits is 2222131968, while the sum is 75.

The spelling of 66666672793920 in words is "sixty-six trillion, six hundred sixty-six billion, six hundred seventy-two million, seven hundred ninety-three thousand, nine hundred twenty".