83666321 has 2 divisors, whose sum is σ = 83666322. Its totient is φ = 83666320.

The previous prime is 83666269. The next prime is 83666327. The reversal of 83666321 is 12366638.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79210000 + 4456321 = 8900^2 + 2111^2 .

It is a cyclic number.

It is not a de Polignac number, because 83666321 - 2¹⁸ = 83404177 is a prime.

It is not a weakly prime, because it can be changed into another prime (83666327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41833160 + 41833161.

It is an arithmetic number, because the mean of its divisors is an integer number (41833161).

Almost surely, 2^83666321 is an apocalyptic number.

It is an amenable number.

83666321 is a deficient number, since it is larger than the sum of its proper divisors (1).

83666321 is an equidigital number, since it uses as much as digits as its factorization.

83666321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 35.

The square root of 83666321 is about 9146.9295941316. The cubic root of 83666321 is about 437.3712422187.

The spelling of 83666321 in words is "eighty-three million, six hundred sixty-six thousand, three hundred twenty-one".