25171649911 has 2 divisors, whose sum is σ = 25171649912. Its totient is φ = 25171649910.

The previous prime is 25171649873. The next prime is 25171649963. The reversal of 25171649911 is 11994617152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25171649911 - 2¹⁵ = 25171617143 is a prime.

It is a super-2 number, since 2×25171649911² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25171649011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12585824955 + 12585824956.

It is an arithmetic number, because the mean of its divisors is an integer number (12585824956).

Almost surely, 2^25171649911 is an apocalyptic number.

25171649911 is a deficient number, since it is larger than the sum of its proper divisors (1).

25171649911 is an equidigital number, since it uses as much as digits as its factorization.

25171649911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 46.

The spelling of 25171649911 in words is "twenty-five billion, one hundred seventy-one million, six hundred forty-nine thousand, nine hundred eleven".