25690618193 has 2 divisors, whose sum is σ = 25690618194. Its totient is φ = 25690618192.

The previous prime is 25690618183. The next prime is 25690618199. The reversal of 25690618193 is 39181609652.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25324584769 + 366033424 = 159137^2 + 19132^2 .

It is a cyclic number.

It is not a de Polignac number, because 25690618193 - 2⁸ = 25690617937 is a prime.

It is not a weakly prime, because it can be changed into another prime (25690618199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12845309096 + 12845309097.

It is an arithmetic number, because the mean of its divisors is an integer number (12845309097).

Almost surely, 2^25690618193 is an apocalyptic number.

It is an amenable number.

25690618193 is a deficient number, since it is larger than the sum of its proper divisors (1).

25690618193 is an equidigital number, since it uses as much as digits as its factorization.

25690618193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 699840, while the sum is 50.

The spelling of 25690618193 in words is "twenty-five billion, six hundred ninety million, six hundred eighteen thousand, one hundred ninety-three".