25997046891797 has 2 divisors, whose sum is σ = 25997046891798. Its totient is φ = 25997046891796.

The previous prime is 25997046891787. The next prime is 25997046891821. The reversal of 25997046891797 is 79719864079952.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23645958269521 + 2351088622276 = 4862711^2 + 1533326^2 .

It is a cyclic number.

It is not a de Polignac number, because 25997046891797 - 2⁶ = 25997046891733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25997046891787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12998523445898 + 12998523445899.

It is an arithmetic number, because the mean of its divisors is an integer number (12998523445899).

Almost surely, 2^{25997046891797} is an apocalyptic number.

It is an amenable number.

25997046891797 is a deficient number, since it is larger than the sum of its proper divisors (1).

25997046891797 is an equidigital number, since it uses as much as digits as its factorization.

25997046891797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320812160, while the sum is 83.

The spelling of 25997046891797 in words is "twenty-five trillion, nine hundred ninety-seven billion, forty-six million, eight hundred ninety-one thousand, seven hundred ninety-seven".