813530660000 has 120 divisors (see below), whose sum is σ = 2016023056740. Its totient is φ = 323035904000.

The previous prime is 813530659967. The next prime is 813530660009. The reversal of 813530660000 is 66035318.

813530660000 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 10 ways, for example, as 26058999184 + 787471660816 = 161428^2 + 887396^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (813530660009) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2591546 + ... + 2888454.

Almost surely, 2^813530660000 is an apocalyptic number.

813530660000 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 813530660000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1008011528370).

813530660000 is an abundant number, since it is smaller than the sum of its proper divisors (1202492396740).

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

813530660000 is a wasteful number, since it uses less digits than its factorization.

813530660000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297076 (or 297053 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

Adding to 813530660000 its reverse (66035318), we get a palindrome (813596695318).

The spelling of 813530660000 in words is "eight hundred thirteen billion, five hundred thirty million, six hundred sixty thousand".