25855255849 has 2 divisors, whose sum is σ = 25855255850. Its totient is φ = 25855255848.

The previous prime is 25855255831. The next prime is 25855255859. The reversal of 25855255849 is 94855255852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19507150224 + 6348105625 = 139668^2 + 79675^2 .

It is a cyclic number.

It is not a de Polignac number, because 25855255849 - 2⁹ = 25855255337 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25855255793 and 25855255802.

It is not a weakly prime, because it can be changed into another prime (25855255859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12927627924 + 12927627925.

It is an arithmetic number, because the mean of its divisors is an integer number (12927627925).

Almost surely, 2^25855255849 is an apocalyptic number.

It is an amenable number.

25855255849 is a deficient number, since it is larger than the sum of its proper divisors (1).

25855255849 is an equidigital number, since it uses as much as digits as its factorization.

25855255849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800000, while the sum is 58.

The spelling of 25855255849 in words is "twenty-five billion, eight hundred fifty-five million, two hundred fifty-five thousand, eight hundred forty-nine".