26390378189 has 16 divisors (see below), whose sum is σ = 31206643200. Its totient is φ = 21835976064.

The previous prime is 26390378171. The next prime is 26390378207. The reversal of 26390378189 is 98187309362.

It is an interprime number because it is at equal distance from previous prime (26390378171) and next prime (26390378207).

It is not a de Polignac number, because 26390378189 - 2²⁴ = 26373600973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26390378789) 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, 1382492 + ... + 1401450.

It is an arithmetic number, because the mean of its divisors is an integer number (1950415200).

Almost surely, 2^26390378189 is an apocalyptic number.

26390378189 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

26390378189 is a deficient number, since it is larger than the sum of its proper divisors (4816265011).

26390378189 is a wasteful number, since it uses less digits than its factorization.

26390378189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25852.

The product of its (nonzero) digits is 3919104, while the sum is 56.

The spelling of 26390378189 in words is "twenty-six billion, three hundred ninety million, three hundred seventy-eight thousand, one hundred eighty-nine".