25571089889 has 2 divisors, whose sum is σ = 25571089890. Its totient is φ = 25571089888.

The previous prime is 25571089853. The next prime is 25571089931. The reversal of 25571089889 is 98898017552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22146499489 + 3424590400 = 148817^2 + 58520^2 .

It is a cyclic number.

It is not a de Polignac number, because 25571089889 - 2²⁰ = 25570041313 is a prime.

It is a super-2 number, since 2×25571089889² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25571088889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12785544944 + 12785544945.

It is an arithmetic number, because the mean of its divisors is an integer number (12785544945).

Almost surely, 2^25571089889 is an apocalyptic number.

It is an amenable number.

25571089889 is a deficient number, since it is larger than the sum of its proper divisors (1).

25571089889 is an equidigital number, since it uses as much as digits as its factorization.

25571089889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14515200, while the sum is 62.

The spelling of 25571089889 in words is "twenty-five billion, five hundred seventy-one million, eighty-nine thousand, eight hundred eighty-nine".