664979722200 has 240 divisors, whose sum is σ = 2310334524960. Its totient is φ = 177269472000.

The previous prime is 664979722171. The next prime is 664979722219. The reversal of 664979722200 is 2227979466.

664979722200 is a `hidden beast` number, since 66 + 497 + 9 + 72 + 2 + 20 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 74369730 + ... + 74378670.

It is an arithmetic number, because the mean of its divisors is an integer number (9626393854).

Almost surely, 2^664979722200 is an apocalyptic number.

664979722200 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664979722200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1155167262480).

664979722200 is an abundant number, since it is smaller than the sum of its proper divisors (1645354802760).

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

664979722200 is a wasteful number, since it uses less digits than its factorization.

664979722200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13560 (or 13542 counting only the distinct ones).

The product of its (nonzero) digits is 4572288, while the sum is 54.

The spelling of 664979722200 in words is "six hundred sixty-four billion, nine hundred seventy-nine million, seven hundred twenty-two thousand, two hundred".