816766767872 has 36 divisors (see below), whose sum is σ = 1778556050376. Its totient is φ = 371257620480.

The previous prime is 816766767827. The next prime is 816766767877. The reversal of 816766767872 is 278767667618.

It is a junction number, because it is equal to n+sod(n) for n = 816766767796 and 816766767805.

It is not an unprimeable number, because it can be changed into a prime (816766767877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145019693 + ... + 145025324.

Almost surely, 2^816766767872 is an apocalyptic number.

It is an amenable number.

816766767872 is an abundant number, since it is smaller than the sum of its proper divisors (961789282504).

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

816766767872 is a wasteful number, since it uses less digits than its factorization.

816766767872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290045044 (or 290045030 counting only the distinct ones).

The product of its digits is 398297088, while the sum is 71.

The spelling of 816766767872 in words is "eight hundred sixteen billion, seven hundred sixty-six million, seven hundred sixty-seven thousand, eight hundred seventy-two".