25878344365 has 4 divisors (see below), whose sum is σ = 31054013244. Its totient is φ = 20702675488.

The previous prime is 25878344363. The next prime is 25878344377. The reversal of 25878344365 is 56344387852.

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 4352172841 + 21526171524 = 65971^2 + 146718^2 .

It is a cyclic number.

It is not a de Polignac number, because 25878344365 - 2¹ = 25878344363 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 (25878344363) 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, 2587834432 + ... + 2587834441.

It is an arithmetic number, because the mean of its divisors is an integer number (7763503311).

Almost surely, 2^25878344365 is an apocalyptic number.

It is an amenable number.

25878344365 is a deficient number, since it is larger than the sum of its proper divisors (5175668879).

25878344365 is an equidigital number, since it uses as much as digits as its factorization.

25878344365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5175668878.

The product of its digits is 19353600, while the sum is 55.

The spelling of 25878344365 in words is "twenty-five billion, eight hundred seventy-eight million, three hundred forty-four thousand, three hundred sixty-five".