66817715628 has 48 divisors (see below), whose sum is σ = 160279870464. Its totient is φ = 21654297600.

The previous prime is 66817715599. The next prime is 66817715681. The reversal of 66817715628 is 82651771866.

It is a happy number.

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, 307125 + ... + 477452.

It is an arithmetic number, because the mean of its divisors is an integer number (3339163968).

Almost surely, 2^66817715628 is an apocalyptic number.

It is an amenable number.

66817715628 is an abundant number, since it is smaller than the sum of its proper divisors (93462154836).

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

66817715628 is a wasteful number, since it uses less digits than its factorization.

66817715628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784782 (or 784780 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 57.

The spelling of 66817715628 in words is "sixty-six billion, eight hundred seventeen million, seven hundred fifteen thousand, six hundred twenty-eight".