66120445766564 has 24 divisors (see below), whose sum is σ = 135814969684800. Its totient is φ = 27571460010336.

The previous prime is 66120445766537. The next prime is 66120445766587. The reversal of 66120445766564 is 46566754402166.

It is a junction number, because it is equal to n+sod(n) for n = 66120445766497 and 66120445766506.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31911411014 + ... + 31911413085.

It is an arithmetic number, because the mean of its divisors is an integer number (5658957070200).

Almost surely, 2^{66120445766564} is an apocalyptic number.

It is an amenable number.

66120445766564 is an abundant number, since it is smaller than the sum of its proper divisors (69694523918236).

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

66120445766564 is a wasteful number, since it uses less digits than its factorization.

66120445766564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63822824147 (or 63822824145 counting only the distinct ones).

The product of its (nonzero) digits is 174182400, while the sum is 62.

The spelling of 66120445766564 in words is "sixty-six trillion, one hundred twenty billion, four hundred forty-five million, seven hundred sixty-six thousand, five hundred sixty-four".