66578630784 has 64 divisors (see below), whose sum is σ = 177976079040. Its totient is φ = 22051501056.

The previous prime is 66578630779. The next prime is 66578630837. The reversal of 66578630784 is 48703687566.

It is a tau number, because it is divible by the number of its divisors (64).

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, 491884 + ... + 612459.

It is an arithmetic number, because the mean of its divisors is an integer number (2780876235).

Almost surely, 2^66578630784 is an apocalyptic number.

66578630784 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

66578630784 is an abundant number, since it is smaller than the sum of its proper divisors (111397448256).

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

66578630784 is a wasteful number, since it uses less digits than its factorization.

66578630784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1104517 (or 1104505 counting only the distinct ones).

The product of its (nonzero) digits is 40642560, while the sum is 60.

The spelling of 66578630784 in words is "sixty-six billion, five hundred seventy-eight million, six hundred thirty thousand, seven hundred eighty-four".