25663997 has 8 divisors (see below), whose sum is σ = 26218080. Its totient is φ = 25114000.

The previous prime is 25663993. The next prime is 25664017. The reversal of 25663997 is 79936652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25663997 - 2² = 25663993 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25663993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13943 + ... + 15675.

It is an arithmetic number, because the mean of its divisors is an integer number (3277260).

Almost surely, 2^25663997 is an apocalyptic number.

It is an amenable number.

25663997 is a deficient number, since it is larger than the sum of its proper divisors (554083).

25663997 is a wasteful number, since it uses less digits than its factorization.

25663997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2043.

The product of its digits is 612360, while the sum is 47.

The square root of 25663997 is about 5065.9645675824. The cubic root of 25663997 is about 294.9679061131.

The spelling of 25663997 in words is "twenty-five million, six hundred sixty-three thousand, nine hundred ninety-seven".