83666811 has 4 divisors (see below), whose sum is σ = 111555752. Its totient is φ = 55777872.

The previous prime is 83666789. The next prime is 83666813. The reversal of 83666811 is 11866638.

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

It is not a de Polignac number, because 83666811 - 2¹⁰ = 83665787 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 83666811.

It is not an unprimeable number, because it can be changed into a prime (83666813) 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, 13944466 + ... + 13944471.

It is an arithmetic number, because the mean of its divisors is an integer number (27888938).

Almost surely, 2^83666811 is an apocalyptic number.

83666811 is a deficient number, since it is larger than the sum of its proper divisors (27888941).

83666811 is a wasteful number, since it uses less digits than its factorization.

83666811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27888940.

The product of its digits is 41472, while the sum is 39.

The square root of 83666811 is about 9146.9563790367. The cubic root of 83666811 is about 437.3720960529.

The spelling of 83666811 in words is "eighty-three million, six hundred sixty-six thousand, eight hundred eleven".