25965397771 has 2 divisors, whose sum is σ = 25965397772. Its totient is φ = 25965397770.

The previous prime is 25965397693. The next prime is 25965397807. The reversal of 25965397771 is 17779356952.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25965397771 - 2¹⁷ = 25965266699 is a prime.

It is not a weakly prime, because it can be changed into another prime (25965397571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12982698885 + 12982698886.

It is an arithmetic number, because the mean of its divisors is an integer number (12982698886).

Almost surely, 2^25965397771 is an apocalyptic number.

25965397771 is a deficient number, since it is larger than the sum of its proper divisors (1).

25965397771 is an equidigital number, since it uses as much as digits as its factorization.

25965397771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25004700, while the sum is 61.

The spelling of 25965397771 in words is "twenty-five billion, nine hundred sixty-five million, three hundred ninety-seven thousand, seven hundred seventy-one".