813283266640 has 40 divisors (see below), whose sum is σ = 2036336181768. Its totient is φ = 300289205760.

The previous prime is 813283266487. The next prime is 813283266661. The reversal of 813283266640 is 46662382318.

It can be written as a sum of positive squares in 4 ways, for example, as 16091429904 + 797191836736 = 126852^2 + 892856^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×813283266640² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 391000531 + ... + 391002610.

Almost surely, 2^813283266640 is an apocalyptic number.

813283266640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

813283266640 is an abundant number, since it is smaller than the sum of its proper divisors (1223052915128).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

813283266640 is a wasteful number, since it uses less digits than its factorization.

813283266640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782003167 (or 782003161 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 49.

The spelling of 813283266640 in words is "eight hundred thirteen billion, two hundred eighty-three million, two hundred sixty-six thousand, six hundred forty".