25542251525 has 48 divisors (see below), whose sum is σ = 37841935104. Its totient is φ = 16721633280.

The previous prime is 25542251521. The next prime is 25542251531. The reversal of 25542251525 is 52515224552.

It is not a de Polignac number, because 25542251525 - 2² = 25542251521 is a prime.

It is a super-2 number, since 2×25542251525² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25542251521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2236229 + ... + 2247621.

It is an arithmetic number, because the mean of its divisors is an integer number (788373648).

Almost surely, 2^25542251525 is an apocalyptic number.

25542251525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25542251525 is a deficient number, since it is larger than the sum of its proper divisors (12299683579).

25542251525 is a wasteful number, since it uses less digits than its factorization.

25542251525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11990 (or 11985 counting only the distinct ones).

The product of its digits is 200000, while the sum is 38.

The spelling of 25542251525 in words is "twenty-five billion, five hundred forty-two million, two hundred fifty-one thousand, five hundred twenty-five".