25664986 has 4 divisors (see below), whose sum is σ = 38497482. Its totient is φ = 12832492.

The previous prime is 25664983. The next prime is 25665041. The reversal of 25664986 is 68946652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 25310961 + 354025 = 5031^2 + 595^2 .

It is not an unprimeable number, because it can be changed into a prime (25664983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6416245 + ... + 6416248.

Almost surely, 2^25664986 is an apocalyptic number.

25664986 is a deficient number, since it is larger than the sum of its proper divisors (12832496).

25664986 is a wasteful number, since it uses less digits than its factorization.

25664986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12832495.

The product of its digits is 622080, while the sum is 46.

The square root of 25664986 is about 5066.0621788525. The cubic root of 25664986 is about 294.9716950723.

The spelling of 25664986 in words is "twenty-five million, six hundred sixty-four thousand, nine hundred eighty-six".