25818383761 has 3 divisors (see below), whose sum is σ = 25818544443. Its totient is φ = 25818223080.

The previous prime is 25818383749. The next prime is 25818383771. The reversal of 25818383761 is 16738381852.

It is a happy number.

The square root of 25818383761 is 160681.

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., 18017961361 + 7800422400 = 134231^2 + 88320^2 .

It is not a de Polignac number, because 25818383761 - 2²⁹ = 25281512849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25818383699 and 25818383708.

It is not an unprimeable number, because it can be changed into a prime (25818383741) 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, 80341 + ... + 241021.

It is an arithmetic number, because the mean of its divisors is an integer number (8606181481).

Almost surely, 2^25818383761 is an apocalyptic number.

25818383761 is the 160681-st square number.

25818383761 is the 80341-st centered octagonal number.

It is an amenable number.

25818383761 is a deficient number, since it is larger than the sum of its proper divisors (160682).

25818383761 is an frugal number, since it uses more digits than its factorization.

25818383761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321362 (or 160681 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 52.

The spelling of 25818383761 in words is "twenty-five billion, eight hundred eighteen million, three hundred eighty-three thousand, seven hundred sixty-one".