668260925 has 6 divisors (see below), whose sum is σ = 828643578. Its totient is φ = 534608720.

The previous prime is 668260897. The next prime is 668260997. The reversal of 668260925 is 529062866.

It can be written as a sum of positive squares in 3 ways, for example, as 133217764 + 535043161 = 11542^2 + 23131^2 .

It is not a de Polignac number, because 668260925 - 2⁸ = 668260669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13365194 + ... + 13365243.

It is an arithmetic number, because the mean of its divisors is an integer number (138107263).

Almost surely, 2^668260925 is an apocalyptic number.

It is an amenable number.

668260925 is a deficient number, since it is larger than the sum of its proper divisors (160382653).

668260925 is a wasteful number, since it uses less digits than its factorization.

668260925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26730447 (or 26730442 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 44.

The square root of 668260925 is about 25850.7432194898. The cubic root of 668260925 is about 874.2762668544.

The spelling of 668260925 in words is "six hundred sixty-eight million, two hundred sixty thousand, nine hundred twenty-five".