25663421 has 8 divisors (see below), whose sum is σ = 31055040. Its totient is φ = 20703168.

The previous prime is 25663399. The next prime is 25663481. The reversal of 25663421 is 12436652.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25663421 is a prime.

It is a super-2 number, since 2×25663421² = 1317222354846482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25663481) 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, 107711 + ... + 107948.

It is an arithmetic number, because the mean of its divisors is an integer number (3881880).

Almost surely, 2^25663421 is an apocalyptic number.

It is an amenable number.

25663421 is a deficient number, since it is larger than the sum of its proper divisors (5391619).

25663421 is a wasteful number, since it uses less digits than its factorization.

25663421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215683.

The product of its digits is 8640, while the sum is 29.

The square root of 25663421 is about 5065.9077172803. The cubic root of 25663421 is about 294.9656993539.

The spelling of 25663421 in words is "twenty-five million, six hundred sixty-three thousand, four hundred twenty-one".