25515138522 has 8 divisors (see below), whose sum is σ = 51030277056. Its totient is φ = 8505046172.

The previous prime is 25515138487. The next prime is 25515138547. The reversal of 25515138522 is 22583151552.

It is a sphenic number, since it is the product of 3 distinct primes.

25515138522 is an admirable number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2126261538 + ... + 2126261549.

It is an arithmetic number, because the mean of its divisors is an integer number (6378784632).

Almost surely, 2^25515138522 is an apocalyptic number.

25515138522 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25515138522 is a wasteful number, since it uses less digits than its factorization.

25515138522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4252523092.

The product of its digits is 120000, while the sum is 39.

The spelling of 25515138522 in words is "twenty-five billion, five hundred fifteen million, one hundred thirty-eight thousand, five hundred twenty-two".