25555055525 has 12 divisors (see below), whose sum is σ = 31778048292. Its totient is φ = 20386122240.

The previous prime is 25555055521. The next prime is 25555055543. The reversal of 25555055525 is 52555055552.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 919241761 + 24635813764 = 30319^2 + 156958^2 .

It is not a de Polignac number, because 25555055525 - 2² = 25555055521 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25555055521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1439054 + ... + 1456703.

It is an arithmetic number, because the mean of its divisors is an integer number (2648170691).

Almost surely, 2^25555055525 is an apocalyptic number.

25555055525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25555055525 is a deficient number, since it is larger than the sum of its proper divisors (6222992767).

25555055525 is a wasteful number, since it uses less digits than its factorization.

25555055525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2896120 (or 2896115 counting only the distinct ones).

The product of its (nonzero) digits is 1562500, while the sum is 44.

The spelling of 25555055525 in words is "twenty-five billion, five hundred fifty-five million, fifty-five thousand, five hundred twenty-five".