66517857628 has 24 divisors (see below), whose sum is σ = 116989266240. Its totient is φ = 33092590080.

The previous prime is 66517857619. The next prime is 66517857667. The reversal of 66517857628 is 82675871566.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1121133 + ... + 1178971.

It is an arithmetic number, because the mean of its divisors is an integer number (4874552760).

Almost surely, 2^66517857628 is an apocalyptic number.

It is an amenable number.

66517857628 is a deficient number, since it is larger than the sum of its proper divisors (50471408612).

66517857628 is a wasteful number, since it uses less digits than its factorization.

66517857628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59277 (or 59275 counting only the distinct ones).

The product of its digits is 33868800, while the sum is 61.

The spelling of 66517857628 in words is "sixty-six billion, five hundred seventeen million, eight hundred fifty-seven thousand, six hundred twenty-eight".