25431663 has 8 divisors (see below), whose sum is σ = 33932848. Its totient is φ = 16942464.

The previous prime is 25431631. The next prime is 25431673. The reversal of 25431663 is 36613452.

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

It is not a de Polignac number, because 25431663 - 2⁵ = 25431631 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25431663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25431673) 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, 5031 + ... + 8727.

It is an arithmetic number, because the mean of its divisors is an integer number (4241606).

Almost surely, 2^25431663 is an apocalyptic number.

25431663 is a deficient number, since it is larger than the sum of its proper divisors (8501185).

25431663 is a wasteful number, since it uses less digits than its factorization.

25431663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5993.

The product of its digits is 12960, while the sum is 30.

The square root of 25431663 is about 5042.9815585624. The cubic root of 25431663 is about 294.0750999780.

The spelling of 25431663 in words is "twenty-five million, four hundred thirty-one thousand, six hundred sixty-three".