25515909163 has 2 divisors, whose sum is σ = 25515909164. Its totient is φ = 25515909162.

The previous prime is 25515909157. The next prime is 25515909203. The reversal of 25515909163 is 36190951552.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25515909163 is a prime.

It is not a weakly prime, because it can be changed into another prime (25515909103) 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, 12757954581 + 12757954582.

It is an arithmetic number, because the mean of its divisors is an integer number (12757954582).

Almost surely, 2^25515909163 is an apocalyptic number.

25515909163 is a deficient number, since it is larger than the sum of its proper divisors (1).

25515909163 is an equidigital number, since it uses as much as digits as its factorization.

25515909163 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 364500, while the sum is 46.

The spelling of 25515909163 in words is "twenty-five billion, five hundred fifteen million, nine hundred nine thousand, one hundred sixty-three".