25418243761 has 3 divisors (see below), whose sum is σ = 25418403193. Its totient is φ = 25418084330.

The previous prime is 25418243749. The next prime is 25418243771. The reversal of 25418243761 is 16734281452.

The square root of 25418243761 is 159431.

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 is not a de Polignac number, because 25418243761 - 2⁵ = 25418243729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25418243701) 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, 79716 + ... + 239146.

Almost surely, 2^25418243761 is an apocalyptic number.

25418243761 is the 159431-st square number.

25418243761 is the 79716-th centered octagonal number.

It is an amenable number.

25418243761 is a deficient number, since it is larger than the sum of its proper divisors (159432).

25418243761 is an frugal number, since it uses more digits than its factorization.

25418243761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318862 (or 159431 counting only the distinct ones).

The product of its digits is 322560, while the sum is 43.

The spelling of 25418243761 in words is "twenty-five billion, four hundred eighteen million, two hundred forty-three thousand, seven hundred sixty-one".