25657563 has 4 divisors (see below), whose sum is σ = 34210088. Its totient is φ = 17105040.

The previous prime is 25657519. The next prime is 25657571. The reversal of 25657563 is 36575652.

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

It is not a de Polignac number, because 25657563 - 2¹⁶ = 25592027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25657763) 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, 4276258 + ... + 4276263.

It is an arithmetic number, because the mean of its divisors is an integer number (8552522).

Almost surely, 2^25657563 is an apocalyptic number.

25657563 is a deficient number, since it is larger than the sum of its proper divisors (8552525).

25657563 is an equidigital number, since it uses as much as digits as its factorization.

25657563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8552524.

The product of its digits is 189000, while the sum is 39.

The square root of 25657563 is about 5065.3295055702. The cubic root of 25657563 is about 294.9432544305.

It can be divided in two parts, 2 and 5657563, that added together give a palindrome (5657565).

The spelling of 25657563 in words is "twenty-five million, six hundred fifty-seven thousand, five hundred sixty-three".