25257015205 has 4 divisors (see below), whose sum is σ = 30308418252. Its totient is φ = 20205612160.

The previous prime is 25257015127. The next prime is 25257015253. The reversal of 25257015205 is 50251075252.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9993401089 + 15263614116 = 99967^2 + 123546^2 .

It is not a de Polignac number, because 25257015205 - 2²³ = 25248626597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2525701516 + ... + 2525701525.

It is an arithmetic number, because the mean of its divisors is an integer number (7577104563).

Almost surely, 2^25257015205 is an apocalyptic number.

It is an amenable number.

25257015205 is a deficient number, since it is larger than the sum of its proper divisors (5051403047).

25257015205 is an equidigital number, since it uses as much as digits as its factorization.

25257015205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5051403046.

The product of its (nonzero) digits is 35000, while the sum is 34.

The spelling of 25257015205 in words is "twenty-five billion, two hundred fifty-seven million, fifteen thousand, two hundred five".