668860425 has 36 divisors (see below), whose sum is σ = 1217667724. Its totient is φ = 350870400.

The previous prime is 668860421. The next prime is 668860459. The reversal of 668860425 is 524068866.

It can be written as a sum of positive squares in 6 ways, for example, as 65028096 + 603832329 = 8064^2 + 24573^2 .

It is not a de Polignac number, because 668860425 - 2² = 668860421 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (668860421) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 10642 + ... + 38091.

Almost surely, 2^668860425 is an apocalyptic number.

It is an amenable number.

668860425 is a deficient number, since it is larger than the sum of its proper divisors (548807299).

668860425 is a wasteful number, since it uses less digits than its factorization.

668860425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48810 (or 48802 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The square root of 668860425 is about 25862.3360313797. The cubic root of 668860425 is about 874.5376278227.

The spelling of 668860425 in words is "six hundred sixty-eight million, eight hundred sixty thousand, four hundred twenty-five".