813398066 has 16 divisors (see below), whose sum is σ = 1314495000. Its totient is φ = 375259008.

The previous prime is 813398063. The next prime is 813398087. The reversal of 813398066 is 660893318.

813398066 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 432016225 + 381381841 = 20785^2 + 19529^2 .

It is not an unprimeable number, because it can be changed into a prime (813398063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78560 + ... + 88308.

Almost surely, 2^813398066 is an apocalyptic number.

813398066 is a deficient number, since it is larger than the sum of its proper divisors (501096934).

813398066 is a wasteful number, since it uses less digits than its factorization.

813398066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12973.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 813398066 is about 28520.1343965978. The cubic root of 813398066 is about 933.4714617279.

The spelling of 813398066 in words is "eight hundred thirteen million, three hundred ninety-eight thousand, sixty-six".