66841783 has 2 divisors, whose sum is σ = 66841784. Its totient is φ = 66841782.

The previous prime is 66841771. The next prime is 66841799. The reversal of 66841783 is 38714866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66841783 - 2²⁵ = 33287351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66841763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33420891 + 33420892.

It is an arithmetic number, because the mean of its divisors is an integer number (33420892).

Almost surely, 2^66841783 is an apocalyptic number.

66841783 is a deficient number, since it is larger than the sum of its proper divisors (1).

66841783 is an equidigital number, since it uses as much as digits as its factorization.

66841783 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 43.

The square root of 66841783 is about 8175.6824180003. The cubic root of 66841783 is about 405.8348536031.

The spelling of 66841783 in words is "sixty-six million, eight hundred forty-one thousand, seven hundred eighty-three".