25811316961 has 4 divisors (see below), whose sum is σ = 25902523312. Its totient is φ = 25720110612.

The previous prime is 25811316959. The next prime is 25811317003. The reversal of 25811316961 is 16961311852.

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 a cyclic number.

It is not a de Polignac number, because 25811316961 - 2¹ = 25811316959 is a prime.

It is a super-2 number, since 2×25811316961² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25811316361) 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, 45602751 + ... + 45603316.

It is an arithmetic number, because the mean of its divisors is an integer number (6475630828).

Almost surely, 2^25811316961 is an apocalyptic number.

It is an amenable number.

25811316961 is a deficient number, since it is larger than the sum of its proper divisors (91206351).

25811316961 is an equidigital number, since it uses as much as digits as its factorization.

25811316961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91206350.

The product of its digits is 77760, while the sum is 43.

The spelling of 25811316961 in words is "twenty-five billion, eight hundred eleven million, three hundred sixteen thousand, nine hundred sixty-one".