816726821660 has 24 divisors (see below), whose sum is σ = 1716488670960. Its totient is φ = 326431234304.

The previous prime is 816726821633. The next prime is 816726821663. The reversal of 816726821660 is 66128627618.

It is a happy number.

816726821660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816726821663) 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, 16192589 + ... + 16242948.

It is an arithmetic number, because the mean of its divisors is an integer number (71520361290).

Almost surely, 2^816726821660 is an apocalyptic number.

It is an amenable number.

816726821660 is an abundant number, since it is smaller than the sum of its proper divisors (899761849300).

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

816726821660 is a wasteful number, since it uses less digits than its factorization.

816726821660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32436805 (or 32436803 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 53.

The spelling of 816726821660 in words is "eight hundred sixteen billion, seven hundred twenty-six million, eight hundred twenty-one thousand, six hundred sixty".