25542559815 has 16 divisors (see below), whose sum is σ = 41093890656. Its totient is φ = 13547433600.

The previous prime is 25542559781. The next prime is 25542559831. The reversal of 25542559815 is 51895524552.

It is not a de Polignac number, because 25542559815 - 2²⁶ = 25475450951 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4701256 + ... + 4706685.

It is an arithmetic number, because the mean of its divisors is an integer number (2568368166).

Almost surely, 2^25542559815 is an apocalyptic number.

25542559815 is a deficient number, since it is larger than the sum of its proper divisors (15551330841).

25542559815 is a wasteful number, since it uses less digits than its factorization.

25542559815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9408130.

The product of its digits is 3600000, while the sum is 51.

The spelling of 25542559815 in words is "twenty-five billion, five hundred forty-two million, five hundred fifty-nine thousand, eight hundred fifteen".