25275979815 has 16 divisors (see below), whose sum is σ = 40488450048. Its totient is φ = 13464895136.

The previous prime is 25275979727. The next prime is 25275979837. The reversal of 25275979815 is 51897957252.

It is a cyclic number.

It is not a de Polignac number, because 25275979815 - 2¹² = 25275975719 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 963339 + ... + 989228.

It is an arithmetic number, because the mean of its divisors is an integer number (2530528128).

Almost surely, 2^25275979815 is an apocalyptic number.

25275979815 is a deficient number, since it is larger than the sum of its proper divisors (15212470233).

25275979815 is a wasteful number, since it uses less digits than its factorization.

25275979815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1953438.

The product of its digits is 15876000, while the sum is 60.

The spelling of 25275979815 in words is "twenty-five billion, two hundred seventy-five million, nine hundred seventy-nine thousand, eight hundred fifteen".