25179853805 has 4 divisors (see below), whose sum is σ = 30215824572. Its totient is φ = 20143883040.

The previous prime is 25179853799. The next prime is 25179853813. The reversal of 25179853805 is 50835897152.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15158041924 + 10021811881 = 123118^2 + 100109^2 .

It is not a de Polignac number, because 25179853805 - 2⁴ = 25179853789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2517985376 + ... + 2517985385.

It is an arithmetic number, because the mean of its divisors is an integer number (7553956143).

Almost surely, 2^25179853805 is an apocalyptic number.

It is an amenable number.

25179853805 is a deficient number, since it is larger than the sum of its proper divisors (5035970767).

25179853805 is an equidigital number, since it uses as much as digits as its factorization.

25179853805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5035970766.

The product of its (nonzero) digits is 3024000, while the sum is 53.

The spelling of 25179853805 in words is "twenty-five billion, one hundred seventy-nine million, eight hundred fifty-three thousand, eight hundred five".