25056085309 has 2 divisors, whose sum is σ = 25056085310. Its totient is φ = 25056085308.

The previous prime is 25056085279. The next prime is 25056085349. The reversal of 25056085309 is 90358065052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24781686084 + 274399225 = 157422^2 + 16565^2 .

It is a cyclic number.

It is not a de Polignac number, because 25056085309 - 2⁷ = 25056085181 is a prime.

It is a super-2 number, since 2×25056085309² (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 (25056085349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12528042654 + 12528042655.

It is an arithmetic number, because the mean of its divisors is an integer number (12528042655).

Almost surely, 2^25056085309 is an apocalyptic number.

It is an amenable number.

25056085309 is a deficient number, since it is larger than the sum of its proper divisors (1).

25056085309 is an equidigital number, since it uses as much as digits as its factorization.

25056085309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324000, while the sum is 43.

The spelling of 25056085309 in words is "twenty-five billion, fifty-six million, eighty-five thousand, three hundred nine".