83666057 has 2 divisors, whose sum is σ = 83666058. Its totient is φ = 83666056.

The previous prime is 83666053. The next prime is 83666059. The reversal of 83666057 is 75066638.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70241161 + 13424896 = 8381^2 + 3664^2 .

It is a cyclic number.

It is not a de Polignac number, because 83666057 - 2² = 83666053 is a prime.

Together with 83666059, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (83666053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41833028 + 41833029.

It is an arithmetic number, because the mean of its divisors is an integer number (41833029).

Almost surely, 2^83666057 is an apocalyptic number.

It is an amenable number.

83666057 is a deficient number, since it is larger than the sum of its proper divisors (1).

83666057 is an equidigital number, since it uses as much as digits as its factorization.

83666057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 83666057 is about 9146.9151630481. The cubic root of 83666057 is about 437.3707821924.

The spelling of 83666057 in words is "eighty-three million, six hundred sixty-six thousand, fifty-seven".