26804434171989 has 16 divisors (see below), whose sum is σ = 36563346359424. Its totient is φ = 17462026982400.

The previous prime is 26804434171981. The next prime is 26804434172017. The reversal of 26804434171989 is 98917143440862.

It is not a de Polignac number, because 26804434171989 - 2³ = 26804434171981 is a prime.

It is a super-2 number, since 2×26804434171989² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26804434171981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 556800772 + ... + 556848909.

It is an arithmetic number, because the mean of its divisors is an integer number (2285209147464).

Almost surely, 2^{26804434171989} is an apocalyptic number.

It is an amenable number.

26804434171989 is a deficient number, since it is larger than the sum of its proper divisors (9758912187435).

26804434171989 is a wasteful number, since it uses less digits than its factorization.

26804434171989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1113649868.

The product of its (nonzero) digits is 83607552, while the sum is 66.

The spelling of 26804434171989 in words is "twenty-six trillion, eight hundred four billion, four hundred thirty-four million, one hundred seventy-one thousand, nine hundred eighty-nine".