665898374680 has 256 divisors, whose sum is σ = 1935363456000. Its totient is φ = 200087193600.

The previous prime is 665898374623. The next prime is 665898374699. The reversal of 665898374680 is 86473898566.

It is a Harshad number since it is a multiple of its sum of digits (70).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 61714726 + ... + 61725514.

It is an arithmetic number, because the mean of its divisors is an integer number (7560013500).

Almost surely, 2^665898374680 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 665898374680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (967681728000).

665898374680 is an abundant number, since it is smaller than the sum of its proper divisors (1269465081320).

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

665898374680 is a wasteful number, since it uses less digits than its factorization.

665898374680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11538 (or 11534 counting only the distinct ones).

The product of its (nonzero) digits is 418037760, while the sum is 70.

The spelling of 665898374680 in words is "six hundred sixty-five billion, eight hundred ninety-eight million, three hundred seventy-four thousand, six hundred eighty".