25858635625 has 10 divisors (see below), whose sum is σ = 32312951858. Its totient is φ = 20686908000.

The previous prime is 25858635533. The next prime is 25858635629. The reversal of 25858635625 is 52653685852.

It can be written as a sum of positive squares in 5 ways, for example, as 14834265616 + 11024370009 = 121796^2 + 104997^2 .

It is not a de Polignac number, because 25858635625 - 2⁷ = 25858635497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25858635629) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 20686284 + ... + 20687533.

Almost surely, 2^25858635625 is an apocalyptic number.

25858635625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25858635625 is a deficient number, since it is larger than the sum of its proper divisors (6454316233).

25858635625 is an frugal number, since it uses more digits than its factorization.

25858635625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41373837 (or 41373822 counting only the distinct ones).

The product of its digits is 17280000, while the sum is 55.

The spelling of 25858635625 in words is "twenty-five billion, eight hundred fifty-eight million, six hundred thirty-five thousand, six hundred twenty-five".