25965397739 has 4 divisors (see below), whose sum is σ = 27331997640. Its totient is φ = 24598797840.

The previous prime is 25965397693. The next prime is 25965397771. The reversal of 25965397739 is 93779356952.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25965397739 - 2⁸ = 25965397483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25965357739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 683299922 + ... + 683299959.

It is an arithmetic number, because the mean of its divisors is an integer number (6832999410).

Almost surely, 2^25965397739 is an apocalyptic number.

25965397739 is a deficient number, since it is larger than the sum of its proper divisors (1366599901).

25965397739 is a wasteful number, since it uses less digits than its factorization.

25965397739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1366599900.

The product of its digits is 96446700, while the sum is 65.

The spelling of 25965397739 in words is "twenty-five billion, nine hundred sixty-five million, three hundred ninety-seven thousand, seven hundred thirty-nine".