25657990789 has 4 divisors (see below), whose sum is σ = 25662559456. Its totient is φ = 25653422124.

The previous prime is 25657990781. The next prime is 25657990817. The reversal of 25657990789 is 98709975652.

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 25657990789 - 2³ = 25657990781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25657990781) 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, 2275899 + ... + 2287144.

It is an arithmetic number, because the mean of its divisors is an integer number (6415639864).

Almost surely, 2^25657990789 is an apocalyptic number.

It is an amenable number.

25657990789 is a deficient number, since it is larger than the sum of its proper divisors (4568667).

25657990789 is an equidigital number, since it uses as much as digits as its factorization.

25657990789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4568666.

The product of its (nonzero) digits is 85730400, while the sum is 67.

The spelling of 25657990789 in words is "twenty-five billion, six hundred fifty-seven million, nine hundred ninety thousand, seven hundred eighty-nine".