66978935586 has 16 divisors (see below), whose sum is σ = 148842079200. Its totient is φ = 22326311844.

The previous prime is 66978935567. The next prime is 66978935591. The reversal of 66978935586 is 68553987966.

66978935586 is a `hidden beast` number, since 6 + 6 + 9 + 7 + 8 + 9 + 35 + 586 = 666.

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, 620175276 + ... + 620175383.

It is an arithmetic number, because the mean of its divisors is an integer number (9302629950).

Almost surely, 2^66978935586 is an apocalyptic number.

66978935586 is an abundant number, since it is smaller than the sum of its proper divisors (81863143614).

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

66978935586 is a wasteful number, since it uses less digits than its factorization.

66978935586 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240350670 (or 1240350664 counting only the distinct ones).

The product of its digits is 587865600, while the sum is 72.

The spelling of 66978935586 in words is "sixty-six billion, nine hundred seventy-eight million, nine hundred thirty-five thousand, five hundred eighty-six".