25105431625 has 8 divisors (see below), whose sum is σ = 31331578824. Its totient is φ = 20084345200.

The previous prime is 25105431607. The next prime is 25105431713. The reversal of 25105431625 is 52613450152.

It can be written as a sum of positive squares in 4 ways, for example, as 349241344 + 24756190281 = 18688^2 + 157341^2 .

It is not a de Polignac number, because 25105431625 - 2²³ = 25097043017 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100421602 + ... + 100421851.

It is an arithmetic number, because the mean of its divisors is an integer number (3916447353).

Almost surely, 2^25105431625 is an apocalyptic number.

25105431625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25105431625 is a deficient number, since it is larger than the sum of its proper divisors (6226147199).

25105431625 is an equidigital number, since it uses as much as digits as its factorization.

25105431625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200843468 (or 200843458 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 34.

Adding to 25105431625 its reverse (52613450152), we get a palindrome (77718881777).

The spelling of 25105431625 in words is "twenty-five billion, one hundred five million, four hundred thirty-one thousand, six hundred twenty-five".