816566885 has 8 divisors (see below), whose sum is σ = 987361056. Its totient is φ = 648266320.

The previous prime is 816566869. The next prime is 816566909. The reversal of 816566885 is 588665618.

816566885 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 816566885 - 2⁴ = 816566869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 622679 + ... + 623988.

It is an arithmetic number, because the mean of its divisors is an integer number (123420132).

Almost surely, 2^816566885 is an apocalyptic number.

It is an amenable number.

816566885 is a deficient number, since it is larger than the sum of its proper divisors (170794171).

816566885 is a wasteful number, since it uses less digits than its factorization.

816566885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1246803.

The product of its digits is 2764800, while the sum is 53.

The square root of 816566885 is about 28575.6344636475. The cubic root of 816566885 is about 934.6820904384.

The spelling of 816566885 in words is "eight hundred sixteen million, five hundred sixty-six thousand, eight hundred eighty-five".