812562820660 has 48 divisors (see below), whose sum is σ = 1808686275984. Its totient is φ = 305579409408.

The previous prime is 812562820651. The next prime is 812562820673. The reversal of 812562820660 is 66028265218.

It can be written as a sum of positive squares in 8 ways, for example, as 212362445584 + 600200375076 = 460828^2 + 774726^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 812562820660.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 956709 + ... + 1593868.

It is an arithmetic number, because the mean of its divisors is an integer number (37680964083).

Almost surely, 2^812562820660 is an apocalyptic number.

It is an amenable number.

812562820660 is an abundant number, since it is smaller than the sum of its proper divisors (996123455324).

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

812562820660 is a wasteful number, since it uses less digits than its factorization.

812562820660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2551540 (or 2551538 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 46.

The spelling of 812562820660 in words is "eight hundred twelve billion, five hundred sixty-two million, eight hundred twenty thousand, six hundred sixty".