25641623 has 4 divisors (see below), whose sum is σ = 29304720. Its totient is φ = 21978528.

The previous prime is 25641617. The next prime is 25641643. The reversal of 25641623 is 32614652.

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

It is a cyclic number.

It is not a de Polignac number, because 25641623 - 2¹⁸ = 25379479 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 (25641643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1831538 + ... + 1831551.

It is an arithmetic number, because the mean of its divisors is an integer number (7326180).

Almost surely, 2^25641623 is an apocalyptic number.

25641623 is a deficient number, since it is larger than the sum of its proper divisors (3663097).

25641623 is an equidigital number, since it uses as much as digits as its factorization.

25641623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3663096.

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

The square root of 25641623 is about 5063.7558195474. The cubic root of 25641623 is about 294.8821630295.

The spelling of 25641623 in words is "twenty-five million, six hundred forty-one thousand, six hundred twenty-three".