25997046891689 has 2 divisors, whose sum is σ = 25997046891690. Its totient is φ = 25997046891688.

The previous prime is 25997046891659. The next prime is 25997046891733. The reversal of 25997046891689 is 98619864079952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19610726560000 + 6386320331689 = 4428400^2 + 2527117^2 .

It is a cyclic number.

It is not a de Polignac number, because 25997046891689 - 2³² = 25992751924393 is a prime.

It is not a weakly prime, because it can be changed into another prime (25997046891619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12998523445844 + 12998523445845.

It is an arithmetic number, because the mean of its divisors is an integer number (12998523445845).

Almost surely, 2^{25997046891689} is an apocalyptic number.

It is an amenable number.

25997046891689 is a deficient number, since it is larger than the sum of its proper divisors (1).

25997046891689 is an equidigital number, since it uses as much as digits as its factorization.

25997046891689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4232632320, while the sum is 83.

The spelling of 25997046891689 in words is "twenty-five trillion, nine hundred ninety-seven billion, forty-six million, eight hundred ninety-one thousand, six hundred eighty-nine".