83666817 has 32 divisors (see below), whose sum is σ = 134064000. Its totient is φ = 51264576.

The previous prime is 83666813. The next prime is 83666873. The reversal of 83666817 is 71866638.

It is not a de Polignac number, because 83666817 - 2² = 83666813 is a prime.

It is a super-2 number, since 2×83666817² = 14000272533822978, which contains 22 as substring.

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 31 ways as a sum of consecutive naturals, for example, 122158 + ... + 122840.

It is an arithmetic number, because the mean of its divisors is an integer number (4189500).

Almost surely, 2^83666817 is an apocalyptic number.

It is an amenable number.

83666817 is a deficient number, since it is larger than the sum of its proper divisors (50397183).

83666817 is a wasteful number, since it uses less digits than its factorization.

83666817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1054 (or 1048 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 83666817 is about 9146.9567070146. The cubic root of 83666817 is about 437.3721065080.

The spelling of 83666817 in words is "eighty-three million, six hundred sixty-six thousand, eight hundred seventeen".