25134614521 has 27 divisors (see below), whose sum is σ = 26951223117. Its totient is φ = 23438405760.

The previous prime is 25134614513. The next prime is 25134614543. The reversal of 25134614521 is 12541643152.

The square root of 25134614521 is 158539.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 22730085225 + 2404529296 = 150765^2 + 49036^2 .

It is not a de Polignac number, because 25134614521 - 2³ = 25134614513 is a prime.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25134614581) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 222430161 + ... + 222430273.

Almost surely, 2^25134614521 is an apocalyptic number.

25134614521 is the 158539-th square number.

25134614521 is the 79270-th centered octagonal number.

It is an amenable number.

25134614521 is a deficient number, since it is larger than the sum of its proper divisors (1816608596).

25134614521 is an frugal number, since it uses more digits than its factorization.

25134614521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394 (or 197 counting only the distinct ones).

The product of its digits is 28800, while the sum is 34.

The spelling of 25134614521 in words is "twenty-five billion, one hundred thirty-four million, six hundred fourteen thousand, five hundred twenty-one".