25081866889 has 2 divisors, whose sum is σ = 25081866890. Its totient is φ = 25081866888.

The previous prime is 25081866871. The next prime is 25081866893. The reversal of 25081866889 is 98866818052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19724798025 + 5357068864 = 140445^2 + 73192^2 .

It is a cyclic number.

It is not a de Polignac number, because 25081866889 - 2²³ = 25073478281 is a prime.

It is not a weakly prime, because it can be changed into another prime (25081866829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12540933444 + 12540933445.

It is an arithmetic number, because the mean of its divisors is an integer number (12540933445).

Almost surely, 2^25081866889 is an apocalyptic number.

It is an amenable number.

25081866889 is a deficient number, since it is larger than the sum of its proper divisors (1).

25081866889 is an equidigital number, since it uses as much as digits as its factorization.

25081866889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13271040, while the sum is 61.

The spelling of 25081866889 in words is "twenty-five billion, eighty-one million, eight hundred sixty-six thousand, eight hundred eighty-nine".