25651884261 has 4 divisors (see below), whose sum is σ = 34202512352. Its totient is φ = 17101256172.

The previous prime is 25651884229. The next prime is 25651884283. The reversal of 25651884261 is 16248815652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 25651884261 - 2⁵ = 25651884229 is a prime.

It is a super-2 number, since 2×25651884261² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25651884261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25651885261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4275314041 + ... + 4275314046.

It is an arithmetic number, because the mean of its divisors is an integer number (8550628088).

Almost surely, 2^25651884261 is an apocalyptic number.

It is an amenable number.

25651884261 is a deficient number, since it is larger than the sum of its proper divisors (8550628091).

25651884261 is an equidigital number, since it uses as much as digits as its factorization.

25651884261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8550628090.

The product of its digits is 921600, while the sum is 48.

The spelling of 25651884261 in words is "twenty-five billion, six hundred fifty-one million, eight hundred eighty-four thousand, two hundred sixty-one".