25945993169 has 4 divisors (see below), whose sum is σ = 25980914496. Its totient is φ = 25911071844.

The previous prime is 25945993163. The next prime is 25945993201. The reversal of 25945993169 is 96139954952.

It is a happy number.

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 25945993169 - 2⁸ = 25945992913 is a prime.

It is a super-2 number, since 2×25945993169² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25945993163) 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, 17459549 + ... + 17461034.

It is an arithmetic number, because the mean of its divisors is an integer number (6495228624).

Almost surely, 2^25945993169 is an apocalyptic number.

It is an amenable number.

25945993169 is a deficient number, since it is larger than the sum of its proper divisors (34921327).

25945993169 is an equidigital number, since it uses as much as digits as its factorization.

25945993169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34921326.

The product of its digits is 23619600, while the sum is 62.

The spelling of 25945993169 in words is "twenty-five billion, nine hundred forty-five million, nine hundred ninety-three thousand, one hundred sixty-nine".