26305691189 has 2 divisors, whose sum is σ = 26305691190. Its totient is φ = 26305691188.

The previous prime is 26305691177. The next prime is 26305691227. The reversal of 26305691189 is 98119650362.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18432678289 + 7873012900 = 135767^2 + 88730^2 .

It is a cyclic number.

It is not a de Polignac number, because 26305691189 - 2²⁰ = 26304642613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26305691129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13152845594 + 13152845595.

It is an arithmetic number, because the mean of its divisors is an integer number (13152845595).

Almost surely, 2^26305691189 is an apocalyptic number.

It is an amenable number.

26305691189 is a deficient number, since it is larger than the sum of its proper divisors (1).

26305691189 is an equidigital number, since it uses as much as digits as its factorization.

26305691189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 50.

The spelling of 26305691189 in words is "twenty-six billion, three hundred five million, six hundred ninety-one thousand, one hundred eighty-nine".