25379555909 has 4 divisors (see below), whose sum is σ = 25379999820. Its totient is φ = 25379112000.

The previous prime is 25379555893. The next prime is 25379555939. The reversal of 25379555909 is 90955597352.

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 13109563009 + 12269992900 = 114497^2 + 110770^2 .

It is a cyclic number.

It is not a de Polignac number, because 25379555909 - 2⁴ = 25379555893 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 (25379555939) 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, 120842 + ... + 255659.

It is an arithmetic number, because the mean of its divisors is an integer number (6344999955).

Almost surely, 2^25379555909 is an apocalyptic number.

It is an amenable number.

25379555909 is a deficient number, since it is larger than the sum of its proper divisors (443911).

25379555909 is an equidigital number, since it uses as much as digits as its factorization.

25379555909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443910.

The product of its (nonzero) digits is 19136250, while the sum is 59.

The spelling of 25379555909 in words is "twenty-five billion, three hundred seventy-nine million, five hundred fifty-five thousand, nine hundred nine".