66791542776 has 64 divisors (see below), whose sum is σ = 196988897280. Its totient is φ = 18467706240.

The previous prime is 66791542679. The next prime is 66791542787. The reversal of 66791542776 is 67724519766.

It is a super-2 number, since 2×66791542776² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 6407191 + ... + 6417606.

It is an arithmetic number, because the mean of its divisors is an integer number (3077951520).

Almost surely, 2^66791542776 is an apocalyptic number.

It is an amenable number.

66791542776 is an abundant number, since it is smaller than the sum of its proper divisors (130197354504).

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

66791542776 is a wasteful number, since it uses less digits than its factorization.

66791542776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12824844 (or 12824840 counting only the distinct ones).

The product of its digits is 26671680, while the sum is 60.

The spelling of 66791542776 in words is "sixty-six billion, seven hundred ninety-one million, five hundred forty-two thousand, seven hundred seventy-six".