25841855309 has 2 divisors, whose sum is σ = 25841855310. Its totient is φ = 25841855308.

The previous prime is 25841855279. The next prime is 25841855327. The reversal of 25841855309 is 90355814852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24791447209 + 1050408100 = 157453^2 + 32410^2 .

It is a cyclic number.

It is not a de Polignac number, because 25841855309 - 2¹⁶ = 25841789773 is a prime.

It is a super-2 number, since 2×25841855309² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25841855359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12920927654 + 12920927655.

It is an arithmetic number, because the mean of its divisors is an integer number (12920927655).

Almost surely, 2^25841855309 is an apocalyptic number.

It is an amenable number.

25841855309 is a deficient number, since it is larger than the sum of its proper divisors (1).

25841855309 is an equidigital number, since it uses as much as digits as its factorization.

25841855309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728000, while the sum is 50.

The spelling of 25841855309 in words is "twenty-five billion, eight hundred forty-one million, eight hundred fifty-five thousand, three hundred nine".