25873398505 has 4 divisors (see below), whose sum is σ = 31048078212. Its totient is φ = 20698718800.

The previous prime is 25873398491. The next prime is 25873398539. The reversal of 25873398505 is 50589337852.

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 19945630441 + 5927768064 = 141229^2 + 76992^2 .

It is not a de Polignac number, because 25873398505 - 2¹⁹ = 25872874217 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 2587339846 + ... + 2587339855.

It is an arithmetic number, because the mean of its divisors is an integer number (7762019553).

Almost surely, 2^25873398505 is an apocalyptic number.

It is an amenable number.

25873398505 is a deficient number, since it is larger than the sum of its proper divisors (5174679707).

25873398505 is an equidigital number, since it uses as much as digits as its factorization.

25873398505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5174679706.

The product of its (nonzero) digits is 9072000, while the sum is 55.

The spelling of 25873398505 in words is "twenty-five billion, eight hundred seventy-three million, three hundred ninety-eight thousand, five hundred five".