25990019879 has 4 divisors (see below), whose sum is σ = 26064490200. Its totient is φ = 25915549560.

The previous prime is 25990019833. The next prime is 25990019893. The reversal of 25990019879 is 97891009952.

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

It is a cyclic number.

It is not a de Polignac number, because 25990019879 - 2¹⁶ = 25989954343 is a prime.

It is a super-2 number, since 2×25990019879² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25990016879) 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, 37234637 + ... + 37235334.

It is an arithmetic number, because the mean of its divisors is an integer number (6516122550).

Almost surely, 2^25990019879 is an apocalyptic number.

25990019879 is a deficient number, since it is larger than the sum of its proper divisors (74470321).

25990019879 is an equidigital number, since it uses as much as digits as its factorization.

25990019879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74470320.

The product of its (nonzero) digits is 3674160, while the sum is 59.

The spelling of 25990019879 in words is "twenty-five billion, nine hundred ninety million, nineteen thousand, eight hundred seventy-nine".