25876879109 has 2 divisors, whose sum is σ = 25876879110. Its totient is φ = 25876879108.

The previous prime is 25876879087. The next prime is 25876879121. The reversal of 25876879109 is 90197867852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20023099009 + 5853780100 = 141503^2 + 76510^2 .

It is a cyclic number.

It is not a de Polignac number, because 25876879109 - 2²⁴ = 25860101893 is a prime.

It is a super-2 number, since 2×25876879109² (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 (25876879129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12938439554 + 12938439555.

It is an arithmetic number, because the mean of its divisors is an integer number (12938439555).

Almost surely, 2^25876879109 is an apocalyptic number.

It is an amenable number.

25876879109 is a deficient number, since it is larger than the sum of its proper divisors (1).

25876879109 is an equidigital number, since it uses as much as digits as its factorization.

25876879109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15240960, while the sum is 62.

The spelling of 25876879109 in words is "twenty-five billion, eight hundred seventy-six million, eight hundred seventy-nine thousand, one hundred nine".