665337125124 has 81 divisors (see below), whose sum is σ = 1956508716981. Its totient is φ = 190086533280.

The previous prime is 665337125083. The next prime is 665337125129. The reversal of 665337125124 is 421521733566.

The square root of 665337125124 is 815682.

It is a perfect power (a square), and thus also a powerful number.

665337125124 is a `hidden beast` number, since 6 + 6 + 5 + 3 + 371 + 251 + 24 = 666.

It can be written as a sum of positive squares in only one way, i.e., 651704227524 + 13632897600 = 807282^2 + 116760^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 665337125124.

It is not an unprimeable number, because it can be changed into a prime (665337125129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 34248934 + ... + 34268354.

Almost surely, 2^665337125124 is an apocalyptic number.

665337125124 is the 815682-nd square number.

It is an amenable number.

665337125124 is an abundant number, since it is smaller than the sum of its proper divisors (1291171591857).

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

665337125124 is an equidigital number, since it uses as much as digits as its factorization.

665337125124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38866 (or 19433 counting only the distinct ones).

The product of its digits is 907200, while the sum is 45.

The spelling of 665337125124 in words is "six hundred sixty-five billion, three hundred thirty-seven million, one hundred twenty-five thousand, one hundred twenty-four".