665198411720 has 16 divisors (see below), whose sum is σ = 1496696426460. Its totient is φ = 266079364672.

The previous prime is 665198411693. The next prime is 665198411741. The reversal of 665198411720 is 27114891566.

It can be written as a sum of positive squares in 2 ways, for example, as 620083802116 + 45114609604 = 787454^2 + 212402^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8314980107 + ... + 8314980186.

Almost surely, 2^665198411720 is an apocalyptic number.

It is an amenable number.

665198411720 is an abundant number, since it is smaller than the sum of its proper divisors (831498014740).

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

665198411720 is a wasteful number, since it uses less digits than its factorization.

665198411720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16629960304 (or 16629960300 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 50.

The spelling of 665198411720 in words is "six hundred sixty-five billion, one hundred ninety-eight million, four hundred eleven thousand, seven hundred twenty".