26493856889 has 4 divisors (see below), whose sum is σ = 26494630800. Its totient is φ = 26493082980.

The previous prime is 26493856867. The next prime is 26493856913. The reversal of 26493856889 is 98865839462.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26493856889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26493856189) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333107 + ... + 404904.

It is an arithmetic number, because the mean of its divisors is an integer number (6623657700).

Almost surely, 2^26493856889 is an apocalyptic number.

It is an amenable number.

26493856889 is a deficient number, since it is larger than the sum of its proper divisors (773911).

26493856889 is an equidigital number, since it uses as much as digits as its factorization.

26493856889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773910.

The product of its digits is 179159040, while the sum is 68.

The spelling of 26493856889 in words is "twenty-six billion, four hundred ninety-three million, eight hundred fifty-six thousand, eight hundred eighty-nine".