66679467920 has 80 divisors (see below), whose sum is σ = 175742293440. Its totient is φ = 23324308992.

The previous prime is 66679467847. The next prime is 66679467979. The reversal of 66679467920 is 2976497666.

It is a tau number, because it is divible by the number of its divisors (80).

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, 1667474 + ... + 1706993.

It is an arithmetic number, because the mean of its divisors is an integer number (2196778668).

Almost surely, 2^66679467920 is an apocalyptic number.

It is an amenable number.

66679467920 is an abundant number, since it is smaller than the sum of its proper divisors (109062825520).

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

66679467920 is a wasteful number, since it uses less digits than its factorization.

66679467920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3374512 (or 3374506 counting only the distinct ones).

The product of its (nonzero) digits is 41150592, while the sum is 62.

The spelling of 66679467920 in words is "sixty-six billion, six hundred seventy-nine million, four hundred sixty-seven thousand, nine hundred twenty".