664820733072 has 120 divisors (see below), whose sum is σ = 1812809986624. Its totient is φ = 209913023232.

The previous prime is 664820733023. The next prime is 664820733079. The reversal of 664820733072 is 270337028466.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (664820733079) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2488278 + ... + 2742474.

Almost surely, 2^664820733072 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 664820733072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (906404993312).

664820733072 is an abundant number, since it is smaller than the sum of its proper divisors (1147989253552).

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

664820733072 is a wasteful number, since it uses less digits than its factorization.

664820733072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254357 (or 254328 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 48.

The spelling of 664820733072 in words is "six hundred sixty-four billion, eight hundred twenty million, seven hundred thirty-three thousand, seventy-two".