25479250189 has 4 divisors (see below), whose sum is σ = 25483588540. Its totient is φ = 25474911840.

The previous prime is 25479250169. The next prime is 25479250213. The reversal of 25479250189 is 98105297452.

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 18504160900 + 6975089289 = 136030^2 + 83517^2 .

It is a cyclic number.

It is not a de Polignac number, because 25479250189 - 2⁷ = 25479250061 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 (25479250169) 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, 2160354 + ... + 2172115.

It is an arithmetic number, because the mean of its divisors is an integer number (6370897135).

Almost surely, 2^25479250189 is an apocalyptic number.

It is an amenable number.

25479250189 is a deficient number, since it is larger than the sum of its proper divisors (4338351).

25479250189 is an equidigital number, since it uses as much as digits as its factorization.

25479250189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4338350.

The product of its (nonzero) digits is 1814400, while the sum is 52.

The spelling of 25479250189 in words is "twenty-five billion, four hundred seventy-nine million, two hundred fifty thousand, one hundred eighty-nine".