664557836264 has 64 divisors (see below), whose sum is σ = 1486523370240. Its totient is φ = 272325588480.

The previous prime is 664557836263. The next prime is 664557836273. The reversal of 664557836264 is 462638755466.

It is a junction number, because it is equal to n+sod(n) for n = 664557836197 and 664557836206.

It is not an unprimeable number, because it can be changed into a prime (664557836263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3399254 + ... + 3589434.

It is an arithmetic number, because the mean of its divisors is an integer number (23226927660).

Almost surely, 2^664557836264 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 664557836264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (743261685120).

664557836264 is an abundant number, since it is smaller than the sum of its proper divisors (821965533976).

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

664557836264 is a wasteful number, since it uses less digits than its factorization.

664557836264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192930 (or 192926 counting only the distinct ones).

The product of its digits is 174182400, while the sum is 62.

The spelling of 664557836264 in words is "six hundred sixty-four billion, five hundred fifty-seven million, eight hundred thirty-six thousand, two hundred sixty-four".