63666025 has 12 divisors (see below), whose sum is σ = 79074304. Its totient is φ = 50850000.

The previous prime is 63666019. The next prime is 63666077. The reversal of 63666025 is 52066636.

It is not a de Polignac number, because 63666025 - 2⁵ = 63665993 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17080 + ... + 20470.

Almost surely, 2^63666025 is an apocalyptic number.

It is an amenable number.

63666025 is a deficient number, since it is larger than the sum of its proper divisors (15408279).

63666025 is a wasteful number, since it uses less digits than its factorization.

63666025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4152 (or 4147 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 34.

The square root of 63666025 is about 7979.0992599416. The cubic root of 63666025 is about 399.3030049502.

The spelling of 63666025 in words is "sixty-three million, six hundred sixty-six thousand, twenty-five".