66837983 has 2 divisors, whose sum is σ = 66837984. Its totient is φ = 66837982.

The previous prime is 66837971. The next prime is 66837989. The reversal of 66837983 is 38973866.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66837983 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66837989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33418991 + 33418992.

It is an arithmetic number, because the mean of its divisors is an integer number (33418992).

Almost surely, 2^66837983 is an apocalyptic number.

66837983 is a deficient number, since it is larger than the sum of its proper divisors (1).

66837983 is an equidigital number, since it uses as much as digits as its factorization.

66837983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 50.

The square root of 66837983 is about 8175.4500181947. The cubic root of 66837983 is about 405.8271627966.

The spelling of 66837983 in words is "sixty-six million, eight hundred thirty-seven thousand, nine hundred eighty-three".