25395928321 has 3 divisors (see below), whose sum is σ = 25396087683. Its totient is φ = 25395768960.

The previous prime is 25395928319. The next prime is 25395928339. The reversal of 25395928321 is 12382959352.

The square root of 25395928321 is 159361.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1950193921 + 23445734400 = 44161^2 + 153120^2 .

It is not a de Polignac number, because 25395928321 - 2¹ = 25395928319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25395928351) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 79681 + ... + 239041.

It is an arithmetic number, because the mean of its divisors is an integer number (8465362561).

Almost surely, 2^25395928321 is an apocalyptic number.

25395928321 is the 159361-st square number.

25395928321 is the 79681-st centered octagonal number.

It is an amenable number.

25395928321 is a deficient number, since it is larger than the sum of its proper divisors (159362).

25395928321 is an frugal number, since it uses more digits than its factorization.

25395928321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318722 (or 159361 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 49.

Multiplying 25395928321 by its sum of digits (49), we get a square (1244400487729 = 1115527²).

The spelling of 25395928321 in words is "twenty-five billion, three hundred ninety-five million, nine hundred twenty-eight thousand, three hundred twenty-one".