816020907789 has 16 divisors (see below), whose sum is σ = 1146994328000. Its totient is φ = 514615804416.

The previous prime is 816020907763. The next prime is 816020907839. The reversal of 816020907789 is 987709020618.

It is not a de Polignac number, because 816020907789 - 2²³ = 816012519181 is a prime.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816020907749) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10597714 + ... + 10674435.

It is an arithmetic number, because the mean of its divisors is an integer number (71687145500).

Almost surely, 2^816020907789 is an apocalyptic number.

It is an amenable number.

816020907789 is a deficient number, since it is larger than the sum of its proper divisors (330973420211).

816020907789 is a wasteful number, since it uses less digits than its factorization.

816020907789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21272844.

The product of its (nonzero) digits is 3048192, while the sum is 57.

The spelling of 816020907789 in words is "eight hundred sixteen billion, twenty million, nine hundred seven thousand, seven hundred eighty-nine".