816606163 has 4 divisors (see below), whose sum is σ = 835597048. Its totient is φ = 797615280.

The previous prime is 816606151. The next prime is 816606181. The reversal of 816606163 is 361606618.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 816606163 - 2²¹ = 814509011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816606103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9495378 + ... + 9495463.

It is an arithmetic number, because the mean of its divisors is an integer number (208899262).

Almost surely, 2^816606163 is an apocalyptic number.

816606163 is a deficient number, since it is larger than the sum of its proper divisors (18990885).

816606163 is a wasteful number, since it uses less digits than its factorization.

816606163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18990884.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 816606163 is about 28576.3217192136. The cubic root of 816606163 is about 934.6970766999.

The spelling of 816606163 in words is "eight hundred sixteen million, six hundred six thousand, one hundred sixty-three".