25186068989 has 2 divisors, whose sum is σ = 25186068990. Its totient is φ = 25186068988.

The previous prime is 25186068983. The next prime is 25186068991. The reversal of 25186068989 is 98986068152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24245604100 + 940464889 = 155710^2 + 30667^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25186068989 is a prime.

It is a super-2 number, since 2×25186068989² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 25186068991, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25186068983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12593034494 + 12593034495.

It is an arithmetic number, because the mean of its divisors is an integer number (12593034495).

Almost surely, 2^25186068989 is an apocalyptic number.

It is an amenable number.

25186068989 is a deficient number, since it is larger than the sum of its proper divisors (1).

25186068989 is an equidigital number, since it uses as much as digits as its factorization.

25186068989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14929920, while the sum is 62.

The spelling of 25186068989 in words is "twenty-five billion, one hundred eighty-six million, sixty-eight thousand, nine hundred eighty-nine".