816916394566 has 32 divisors (see below), whose sum is σ = 1322229247200. Its totient is φ = 377371146240.

The previous prime is 816916394561. The next prime is 816916394573. The reversal of 816916394566 is 665493619618.

It is a super-3 number, since 3×816916394566³ (a number of 37 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 816916394498 and 816916394507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816916394561) 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, 1407555 + ... + 1901326.

It is an arithmetic number, because the mean of its divisors is an integer number (41319663975).

Almost surely, 2^816916394566 is an apocalyptic number.

816916394566 is a deficient number, since it is larger than the sum of its proper divisors (505312852634).

816916394566 is a wasteful number, since it uses less digits than its factorization.

816916394566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3309064.

The product of its digits is 50388480, while the sum is 64.

The spelling of 816916394566 in words is "eight hundred sixteen billion, nine hundred sixteen million, three hundred ninety-four thousand, five hundred sixty-six".