66816188528 has 20 divisors (see below), whose sum is σ = 129508917000. Its totient is φ = 33394532544.

The previous prime is 66816188513. The next prime is 66816188531. The reversal of 66816188528 is 82588161866.

It is a hoax number, since the sum of its digits (59) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 806903 + ... + 885846.

It is an arithmetic number, because the mean of its divisors is an integer number (6475445850).

Almost surely, 2^66816188528 is an apocalyptic number.

It is an amenable number.

66816188528 is a deficient number, since it is larger than the sum of its proper divisors (62692728472).

66816188528 is a wasteful number, since it uses less digits than its factorization.

66816188528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1695224 (or 1695218 counting only the distinct ones).

The product of its digits is 8847360, while the sum is 59.

The spelling of 66816188528 in words is "sixty-six billion, eight hundred sixteen million, one hundred eighty-eight thousand, five hundred twenty-eight".