25943217879 has 4 divisors (see below), whose sum is σ = 34590957176. Its totient is φ = 17295478584.

The previous prime is 25943217847. The next prime is 25943217913. The reversal of 25943217879 is 97871234952.

It is a happy number.

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

It is not a de Polignac number, because 25943217879 - 2⁵ = 25943217847 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 (25943217809) 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, 4323869644 + ... + 4323869649.

It is an arithmetic number, because the mean of its divisors is an integer number (8647739294).

Almost surely, 2^25943217879 is an apocalyptic number.

25943217879 is a deficient number, since it is larger than the sum of its proper divisors (8647739297).

25943217879 is an equidigital number, since it uses as much as digits as its factorization.

25943217879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8647739296.

The product of its digits is 7620480, while the sum is 57.

The spelling of 25943217879 in words is "twenty-five billion, nine hundred forty-three million, two hundred seventeen thousand, eight hundred seventy-nine".