664798350720 has 1536 divisors, whose sum is σ = 2728654387200. Its totient is φ = 136744796160.

The previous prime is 664798350719. The next prime is 664798350751. The reversal of 664798350720 is 27053897466.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 3444550944 + ... + 3444551136.

It is an arithmetic number, because the mean of its divisors is an integer number (1776467700).

Almost surely, 2^664798350720 is an apocalyptic number.

664798350720 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 664798350720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1364327193600).

664798350720 is an abundant number, since it is smaller than the sum of its proper divisors (2063856036480).

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

664798350720 is a wasteful number, since it uses less digits than its factorization.

664798350720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336 (or 317 counting only the distinct ones).

The product of its (nonzero) digits is 15240960, while the sum is 57.

The spelling of 664798350720 in words is "six hundred sixty-four billion, seven hundred ninety-eight million, three hundred fifty thousand, seven hundred twenty".