66983783 has 2 divisors, whose sum is σ = 66983784. Its totient is φ = 66983782.

The previous prime is 66983779. The next prime is 66983827. The reversal of 66983783 is 38738966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66983783 - 2² = 66983779 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66983753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33491891 + 33491892.

It is an arithmetic number, because the mean of its divisors is an integer number (33491892).

Almost surely, 2^66983783 is an apocalyptic number.

66983783 is a deficient number, since it is larger than the sum of its proper divisors (1).

66983783 is an equidigital number, since it uses as much as digits as its factorization.

66983783 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 66983783 is about 8184.3621009826. The cubic root of 66983783 is about 406.1220381837.

The spelling of 66983783 in words is "sixty-six million, nine hundred eighty-three thousand, seven hundred eighty-three".