663674425 has 24 divisors (see below), whose sum is σ = 858974040. Its totient is φ = 508032000.

The previous prime is 663674413. The next prime is 663674489. The reversal of 663674425 is 524476366.

It can be written as a sum of positive squares in 12 ways, for example, as 134490409 + 529184016 = 11597^2 + 23004^2 .

It is a de Polignac number, because none of the positive numbers 2^k-663674425 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77875 + ... + 85975.

It is an arithmetic number, because the mean of its divisors is an integer number (35790585).

Almost surely, 2^663674425 is an apocalyptic number.

It is an amenable number.

663674425 is a deficient number, since it is larger than the sum of its proper divisors (195299615).

663674425 is a wasteful number, since it uses less digits than its factorization.

663674425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8253 (or 8248 counting only the distinct ones).

The product of its digits is 725760, while the sum is 43.

The square root of 663674425 is about 25761.8792986847. The cubic root of 663674425 is about 872.2715225100.

The spelling of 663674425 in words is "six hundred sixty-three million, six hundred seventy-four thousand, four hundred twenty-five".