664817682156 has 48 divisors (see below), whose sum is σ = 1663694726400. Its totient is φ = 205981244352.

The previous prime is 664817682091. The next prime is 664817682167. The reversal of 664817682156 is 651286718466.

It is a happy number.

664817682156 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 664817682156.

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, 27496096 + ... + 27520263.

It is an arithmetic number, because the mean of its divisors is an integer number (34660306800).

Almost surely, 2^664817682156 is an apocalyptic number.

It is an amenable number.

664817682156 is an abundant number, since it is smaller than the sum of its proper divisors (998877044244).

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

664817682156 is a wasteful number, since it uses less digits than its factorization.

664817682156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55016438 (or 55016436 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 60.

The spelling of 664817682156 in words is "six hundred sixty-four billion, eight hundred seventeen million, six hundred eighty-two thousand, one hundred fifty-six".