668652125 has 8 divisors (see below), whose sum is σ = 834478008. Its totient is φ = 534921600.

The previous prime is 668652119. The next prime is 668652169. The reversal of 668652125 is 521256866.

It can be written as a sum of positive squares in 4 ways, for example, as 103591684 + 565060441 = 10178^2 + 23771^2 .

It is not a de Polignac number, because 668652125 - 2¹⁴ = 668635741 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2674484 + ... + 2674733.

It is an arithmetic number, because the mean of its divisors is an integer number (104309751).

Almost surely, 2^668652125 is an apocalyptic number.

It is an amenable number.

668652125 is a deficient number, since it is larger than the sum of its proper divisors (165825883).

668652125 is an equidigital number, since it uses as much as digits as its factorization.

668652125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5349232 (or 5349222 counting only the distinct ones).

The product of its digits is 172800, while the sum is 41.

The square root of 668652125 is about 25858.3086260490. The cubic root of 668652125 is about 874.4468340414.

The spelling of 668652125 in words is "six hundred sixty-eight million, six hundred fifty-two thousand, one hundred twenty-five".