66120121264 has 10 divisors (see below), whose sum is σ = 128107734980. Its totient is φ = 33060060624.

The previous prime is 66120121241. The next prime is 66120121271. The reversal of 66120121264 is 46212102166.

It is a happy number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2066253774 + ... + 2066253805.

It is an arithmetic number, because the mean of its divisors is an integer number (12810773498).

Almost surely, 2^66120121264 is an apocalyptic number.

It is an amenable number.

66120121264 is a deficient number, since it is larger than the sum of its proper divisors (61987613716).

66120121264 is a wasteful number, since it uses less digits than its factorization.

66120121264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4132507587 (or 4132507581 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The spelling of 66120121264 in words is "sixty-six billion, one hundred twenty million, one hundred twenty-one thousand, two hundred sixty-four".