25525555525 has 24 divisors (see below), whose sum is σ = 32438939400. Its totient is φ = 19913011200.

The previous prime is 25525555513. The next prime is 25525555537. The reversal of 25525555525 is 52555552552.

It is an interprime number because it is at equal distance from previous prime (25525555513) and next prime (25525555537).

It can be written as a sum of positive squares in 12 ways, for example, as 19138508964 + 6387046561 = 138342^2 + 79919^2 .

It is not a de Polignac number, because 25525555525 - 2⁵ = 25525555493 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2854261 + ... + 2863189.

It is an arithmetic number, because the mean of its divisors is an integer number (1351622475).

Almost surely, 2^25525555525 is an apocalyptic number.

25525555525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25525555525 is a deficient number, since it is larger than the sum of its proper divisors (6913383875).

25525555525 is a wasteful number, since it uses less digits than its factorization.

25525555525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11769 (or 11764 counting only the distinct ones).

The product of its digits is 3125000, while the sum is 46.

The spelling of 25525555525 in words is "twenty-five billion, five hundred twenty-five million, five hundred fifty-five thousand, five hundred twenty-five".