25968076781 has 4 divisors (see below), whose sum is σ = 26669916732. Its totient is φ = 25266236832.

The previous prime is 25968076763. The next prime is 25968076819. The reversal of 25968076781 is 18767086952.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10756801225 + 15211275556 = 103715^2 + 123334^2 .

It is a cyclic number.

It is not a de Polignac number, because 25968076781 - 2³⁰ = 24894334957 is a prime.

It is a super-2 number, since 2×25968076781² (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 25968076781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25968076711) 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, 350919920 + ... + 350919993.

It is an arithmetic number, because the mean of its divisors is an integer number (6667479183).

Almost surely, 2^25968076781 is an apocalyptic number.

It is an amenable number.

25968076781 is a deficient number, since it is larger than the sum of its proper divisors (701839951).

25968076781 is an equidigital number, since it uses as much as digits as its factorization.

25968076781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701839950.

The product of its (nonzero) digits is 10160640, while the sum is 59.

The spelling of 25968076781 in words is "twenty-five billion, nine hundred sixty-eight million, seventy-six thousand, seven hundred eighty-one".