25147109917 has 2 divisors, whose sum is σ = 25147109918. Its totient is φ = 25147109916.

The previous prime is 25147109899. The next prime is 25147109927. The reversal of 25147109917 is 71990174152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16649773156 + 8497336761 = 129034^2 + 92181^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25147109917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25147109927) 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, 12573554958 + 12573554959.

It is an arithmetic number, because the mean of its divisors is an integer number (12573554959).

Almost surely, 2^25147109917 is an apocalyptic number.

It is an amenable number.

25147109917 is a deficient number, since it is larger than the sum of its proper divisors (1).

25147109917 is an equidigital number, since it uses as much as digits as its factorization.

25147109917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 158760, while the sum is 46.

The spelling of 25147109917 in words is "twenty-five billion, one hundred forty-seven million, one hundred nine thousand, nine hundred seventeen".