25379038865 has 4 divisors (see below), whose sum is σ = 30454846644. Its totient is φ = 20303231088.

The previous prime is 25379038849. The next prime is 25379038877. The reversal of 25379038865 is 56883097352.

It is a Cunningham number, because it is equal to 159308²+1.

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 9136301056 + 16242737809 = 95584^2 + 127447^2 .

It is a cyclic number.

It is not a de Polignac number, because 25379038865 - 2⁴ = 25379038849 is a prime.

It is a super-2 number, since 2×25379038865² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25379038865.

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, 2537903882 + ... + 2537903891.

It is an arithmetic number, because the mean of its divisors is an integer number (7613711661).

Almost surely, 2^25379038865 is an apocalyptic number.

It is an amenable number.

25379038865 is a deficient number, since it is larger than the sum of its proper divisors (5075807779).

25379038865 is an equidigital number, since it uses as much as digits as its factorization.

25379038865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5075807778.

The product of its (nonzero) digits is 10886400, while the sum is 56.

The spelling of 25379038865 in words is "twenty-five billion, three hundred seventy-nine million, thirty-eight thousand, eight hundred sixty-five".