26818695989 has 2 divisors, whose sum is σ = 26818695990. Its totient is φ = 26818695988.

The previous prime is 26818695983. The next prime is 26818696013. The reversal of 26818695989 is 98959681862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25934525764 + 884170225 = 161042^2 + 29735^2 .

It is a cyclic number.

It is not a de Polignac number, because 26818695989 - 2⁸ = 26818695733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26818695983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13409347994 + 13409347995.

It is an arithmetic number, because the mean of its divisors is an integer number (13409347995).

Almost surely, 2^26818695989 is an apocalyptic number.

It is an amenable number.

26818695989 is a deficient number, since it is larger than the sum of its proper divisors (1).

26818695989 is an equidigital number, since it uses as much as digits as its factorization.

26818695989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 134369280, while the sum is 71.

The spelling of 26818695989 in words is "twenty-six billion, eight hundred eighteen million, six hundred ninety-five thousand, nine hundred eighty-nine".