66955178976 has 72 divisors (see below), whose sum is σ = 204452435880. Its totient is φ = 19130049792.

The previous prime is 66955178893. The next prime is 66955178977. The reversal of 66955178976 is 67987155966.

It is a self number, because there is not a number n which added to its sum of digits gives 66955178976.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66955178977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7112131 + ... + 7121538.

It is an arithmetic number, because the mean of its divisors is an integer number (2839617165).

Almost surely, 2^66955178976 is an apocalyptic number.

It is an amenable number.

66955178976 is an abundant number, since it is smaller than the sum of its proper divisors (137497256904).

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

66955178976 is a wasteful number, since it uses less digits than its factorization.

66955178976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14233696 (or 14233681 counting only the distinct ones).

The product of its digits is 171460800, while the sum is 69.

The spelling of 66955178976 in words is "sixty-six billion, nine hundred fifty-five million, one hundred seventy-eight thousand, nine hundred seventy-six".