818321970989 has 2 divisors, whose sum is σ = 818321970990. Its totient is φ = 818321970988.

The previous prime is 818321970839. The next prime is 818321971003. The reversal of 818321970989 is 989079123818.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 563937917764 + 254384053225 = 750958^2 + 504365^2 .

It is a cyclic number.

It is not a de Polignac number, because 818321970989 - 2²⁰ = 818320922413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (818321970589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409160985494 + 409160985495.

It is an arithmetic number, because the mean of its divisors is an integer number (409160985495).

Almost surely, 2^818321970989 is an apocalyptic number.

It is an amenable number.

818321970989 is a deficient number, since it is larger than the sum of its proper divisors (1).

818321970989 is an equidigital number, since it uses as much as digits as its factorization.

818321970989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15676416, while the sum is 65.

The spelling of 818321970989 in words is "eight hundred eighteen billion, three hundred twenty-one million, nine hundred seventy thousand, nine hundred eighty-nine".