25504409401 has 3 divisors (see below), whose sum is σ = 25504569103. Its totient is φ = 25504249700.

The previous prime is 25504409393. The next prime is 25504409467. The reversal of 25504409401 is 10490440552.

The square root of 25504409401 is 159701.

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., 13018581801 + 12485827600 = 114099^2 + 111740^2 .

It is not a de Polignac number, because 25504409401 - 2³ = 25504409393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25504409101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 79851 + ... + 239551.

Almost surely, 2^25504409401 is an apocalyptic number.

25504409401 is the 159701-st square number.

25504409401 is the 79851-st centered octagonal number.

It is an amenable number.

25504409401 is a deficient number, since it is larger than the sum of its proper divisors (159702).

25504409401 is an frugal number, since it uses more digits than its factorization.

25504409401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319402 (or 159701 counting only the distinct ones).

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

Adding to 25504409401 its reverse (10490440552), we get a palindrome (35994849953).

The spelling of 25504409401 in words is "twenty-five billion, five hundred four million, four hundred nine thousand, four hundred one".