665879628960 has 1920 divisors, whose sum is σ = 3036218701824. Its totient is φ = 133692456960.

The previous prime is 665879628943. The next prime is 665879628989. The reversal of 665879628960 is 69826978566.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 319 ways as a sum of consecutive naturals, for example, 2272626574 + ... + 2272626866.

Almost surely, 2^665879628960 is an apocalyptic number.

665879628960 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 665879628960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1518109350912).

665879628960 is an abundant number, since it is smaller than the sum of its proper divisors (2370339072864).

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

665879628960 is a wasteful number, since it uses less digits than its factorization.

665879628960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428 (or 411 counting only the distinct ones).

The product of its (nonzero) digits is 470292480, while the sum is 72.

The spelling of 665879628960 in words is "six hundred sixty-five billion, eight hundred seventy-nine million, six hundred twenty-eight thousand, nine hundred sixty".