66666120 has 64 divisors (see below), whose sum is σ = 206461440. Its totient is φ = 17203200.

The previous prime is 66666097. The next prime is 66666133. The reversal of 66666120 is 2166666.

66666120 = 90² + 91² + ... + 585².

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, 5241 + ... + 12680.

It is an arithmetic number, because the mean of its divisors is an integer number (3225960).

Almost surely, 2^66666120 is an apocalyptic number.

66666120 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66666120 is an abundant number, since it is smaller than the sum of its proper divisors (139795320).

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

66666120 is a wasteful number, since it uses less digits than its factorization.

66666120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17966 (or 17962 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 66666120 is about 8164.9323328488. The cubic root of 66666120 is about 405.4790247228.

The spelling of 66666120 in words is "sixty-six million, six hundred sixty-six thousand, one hundred twenty".