25815278126 has 48 divisors (see below), whose sum is σ = 43198995840. Its totient is φ = 11560190400.

The previous prime is 25815278123. The next prime is 25815278143. The reversal of 25815278126 is 62187251852.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25815278123) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4771715 + ... + 4777121.

It is an arithmetic number, because the mean of its divisors is an integer number (899979080).

Almost surely, 2^25815278126 is an apocalyptic number.

25815278126 is a deficient number, since it is larger than the sum of its proper divisors (17383717714).

25815278126 is a wasteful number, since it uses less digits than its factorization.

25815278126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5721 (or 5710 counting only the distinct ones).

The product of its digits is 537600, while the sum is 47.

The spelling of 25815278126 in words is "twenty-five billion, eight hundred fifteen million, two hundred seventy-eight thousand, one hundred twenty-six".