25909918361 has 2 divisors, whose sum is σ = 25909918362. Its totient is φ = 25909918360.

The previous prime is 25909918319. The next prime is 25909918403. The reversal of 25909918361 is 16381990952.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (25909918319) and next prime (25909918403).

It can be written as a sum of positive squares in only one way, i.e., 23771780761 + 2138137600 = 154181^2 + 46240^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25909918361 is a prime.

It is not a weakly prime, because it can be changed into another prime (25909918261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12954959180 + 12954959181.

It is an arithmetic number, because the mean of its divisors is an integer number (12954959181).

Almost surely, 2^25909918361 is an apocalyptic number.

It is an amenable number.

25909918361 is a deficient number, since it is larger than the sum of its proper divisors (1).

25909918361 is an equidigital number, since it uses as much as digits as its factorization.

25909918361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1049760, while the sum is 53.

The spelling of 25909918361 in words is "twenty-five billion, nine hundred nine million, nine hundred eighteen thousand, three hundred sixty-one".