25997046891697 has 4 divisors (see below), whose sum is σ = 29710910733376. Its totient is φ = 22283183050020.

The previous prime is 25997046891689. The next prime is 25997046891733. The reversal of 25997046891697 is 79619864079952.

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 25997046891697 - 2³ = 25997046891689 is a prime.

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 25997046891697.

It is not an unprimeable number, because it can be changed into a prime (25997046891797) 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, 1856931920829 + ... + 1856931920842.

It is an arithmetic number, because the mean of its divisors is an integer number (7427727683344).

Almost surely, 2^{25997046891697} is an apocalyptic number.

It is an amenable number.

25997046891697 is a deficient number, since it is larger than the sum of its proper divisors (3713863841679).

25997046891697 is an equidigital number, since it uses as much as digits as its factorization.

25997046891697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3713863841678.

The product of its (nonzero) digits is 3703553280, while the sum is 82.

The spelling of 25997046891697 in words is "twenty-five trillion, nine hundred ninety-seven billion, forty-six million, eight hundred ninety-one thousand, six hundred ninety-seven".