25696993081 has 4 divisors (see below), whose sum is σ = 25701914512. Its totient is φ = 25692071652.

The previous prime is 25696993073. The next prime is 25696993097. The reversal of 25696993081 is 18039969652.

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 25696993081 - 2³ = 25696993073 is a prime.

It is a super-2 number, since 2×25696993081² (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 (25696993001) 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, 2452875 + ... + 2463328.

It is an arithmetic number, because the mean of its divisors is an integer number (6425478628).

Almost surely, 2^25696993081 is an apocalyptic number.

It is an amenable number.

25696993081 is a deficient number, since it is larger than the sum of its proper divisors (4921431).

25696993081 is an equidigital number, since it uses as much as digits as its factorization.

25696993081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4921430.

The product of its (nonzero) digits is 6298560, while the sum is 58.

The spelling of 25696993081 in words is "twenty-five billion, six hundred ninety-six million, nine hundred ninety-three thousand, eighty-one".