66579718504 has 64 divisors (see below), whose sum is σ = 135697766400. Its totient is φ = 30442293504.

The previous prime is 66579718477. The next prime is 66579718507. The reversal of 66579718504 is 40581797566.

It is not an unprimeable number, because it can be changed into a prime (66579718507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9995127 + ... + 10001785.

It is an arithmetic number, because the mean of its divisors is an integer number (2120277600).

Almost surely, 2^66579718504 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66579718504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67848883200).

66579718504 is an abundant number, since it is smaller than the sum of its proper divisors (69118047896).

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

66579718504 is a wasteful number, since it uses less digits than its factorization.

66579718504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7562 (or 7558 counting only the distinct ones).

The product of its (nonzero) digits is 12700800, while the sum is 58.

The spelling of 66579718504 in words is "sixty-six billion, five hundred seventy-nine million, seven hundred eighteen thousand, five hundred four".