665874307731874 has 8 divisors (see below), whose sum is σ = 1006102056208428. Its totient is φ = 330506955662400.

The previous prime is 665874307731797. The next prime is 665874307731877. The reversal of 665874307731874 is 478137703478566.

It can be written as a sum of positive squares in 2 ways, for example, as 614621695149225 + 51252612582649 = 24791565^2 + 7159093^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 665874307731874.

It is not an unprimeable number, because it can be changed into a prime (665874307731877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1215099101427 + ... + 1215099101974.

Almost surely, 2^{665874307731874} is an apocalyptic number.

665874307731874 is a deficient number, since it is larger than the sum of its proper divisors (340227748476554).

665874307731874 is a wasteful number, since it uses less digits than its factorization.

665874307731874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2430198203540.

The product of its (nonzero) digits is 3982970880, while the sum is 76.

The spelling of 665874307731874 in words is "six hundred sixty-five trillion, eight hundred seventy-four billion, three hundred seven million, seven hundred thirty-one thousand, eight hundred seventy-four".