25091668361 has 2 divisors, whose sum is σ = 25091668362. Its totient is φ = 25091668360.

The previous prime is 25091668271. The next prime is 25091668387. The reversal of 25091668361 is 16386619052.

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., 12991668361 + 12100000000 = 113981^2 + 110000^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25091668361 is a prime.

It is a super-2 number, since 2×25091668361² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25091668061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12545834180 + 12545834181.

It is an arithmetic number, because the mean of its divisors is an integer number (12545834181).

Almost surely, 2^25091668361 is an apocalyptic number.

It is an amenable number.

25091668361 is a deficient number, since it is larger than the sum of its proper divisors (1).

25091668361 is an equidigital number, since it uses as much as digits as its factorization.

25091668361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 47.

The spelling of 25091668361 in words is "twenty-five billion, ninety-one million, six hundred sixty-eight thousand, three hundred sixty-one".