25508242369 has 9 divisors (see below), whose sum is σ = 25957502337. Its totient is φ = 25066635924.

The previous prime is 25508242363. The next prime is 25508242379. The reversal of 25508242369 is 96324280552.

The square root of 25508242369 is 159713.

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

It is not a de Polignac number, because 25508242369 - 2¹⁹ = 25507718081 is a prime.

It is a super-2 number, since 2×25508242369² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25508242363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 9421714 + ... + 9424420.

Almost surely, 2^25508242369 is an apocalyptic number.

25508242369 is the 159713-rd square number.

25508242369 is the 79857-th centered octagonal number.

It is an amenable number.

25508242369 is a deficient number, since it is larger than the sum of its proper divisors (449259968).

25508242369 is an frugal number, since it uses more digits than its factorization.

25508242369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5532 (or 2766 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 46.

The spelling of 25508242369 in words is "twenty-five billion, five hundred eight million, two hundred forty-two thousand, three hundred sixty-nine".