26289137889 has 24 divisors (see below), whose sum is σ = 43402312512. Its totient is φ = 15020851680.

The previous prime is 26289137887. The next prime is 26289137923. The reversal of 26289137889 is 98873198262.

It is not a de Polignac number, because 26289137889 - 2¹ = 26289137887 is a prime.

It is a super-2 number, since 2×26289137889² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (26289137881) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1000767 + ... + 1026699.

It is an arithmetic number, because the mean of its divisors is an integer number (1808429688).

Almost surely, 2^26289137889 is an apocalyptic number.

It is an amenable number.

26289137889 is a deficient number, since it is larger than the sum of its proper divisors (17113174623).

26289137889 is a wasteful number, since it uses less digits than its factorization.

26289137889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42037 (or 42034 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 63.

The spelling of 26289137889 in words is "twenty-six billion, two hundred eighty-nine million, one hundred thirty-seven thousand, eight hundred eighty-nine".