25565426531 has 4 divisors (see below), whose sum is σ = 25572004200. Its totient is φ = 25558848864.

The previous prime is 25565426477. The next prime is 25565426543. The reversal of 25565426531 is 13562456552.

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 25565426531 - 2³⁴ = 8385557347 is a prime.

It is a super-2 number, since 2×25565426531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25565425531) 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, 3283001 + ... + 3290778.

It is an arithmetic number, because the mean of its divisors is an integer number (6393001050).

Almost surely, 2^25565426531 is an apocalyptic number.

25565426531 is a deficient number, since it is larger than the sum of its proper divisors (6577669).

25565426531 is an equidigital number, since it uses as much as digits as its factorization.

25565426531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6577668.

The product of its digits is 1080000, while the sum is 44.

The spelling of 25565426531 in words is "twenty-five billion, five hundred sixty-five million, four hundred twenty-six thousand, five hundred thirty-one".