816617811 has 4 divisors (see below), whose sum is σ = 1088823752. Its totient is φ = 544411872.

The previous prime is 816617807. The next prime is 816617843. The reversal of 816617811 is 118716618.

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

It is not a de Polignac number, because 816617811 - 2² = 816617807 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 816617811.

It is not an unprimeable number, because it can be changed into a prime (816617801) 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, 136102966 + ... + 136102971.

It is an arithmetic number, because the mean of its divisors is an integer number (272205938).

Almost surely, 2^816617811 is an apocalyptic number.

816617811 is a deficient number, since it is larger than the sum of its proper divisors (272205941).

816617811 is a wasteful number, since it uses less digits than its factorization.

816617811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272205940.

The product of its digits is 16128, while the sum is 39.

The square root of 816617811 is about 28576.5255235832. The cubic root of 816617811 is about 934.7015208250.

The spelling of 816617811 in words is "eight hundred sixteen million, six hundred seventeen thousand, eight hundred eleven".