66838843 has 2 divisors, whose sum is σ = 66838844. Its totient is φ = 66838842.

The previous prime is 66838817. The next prime is 66838847. The reversal of 66838843 is 34883866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66838843 - 2¹³ = 66830651 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66838793 and 66838802.

It is not a weakly prime, because it can be changed into another prime (66838847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33419421 + 33419422.

It is an arithmetic number, because the mean of its divisors is an integer number (33419422).

Almost surely, 2^66838843 is an apocalyptic number.

66838843 is a deficient number, since it is larger than the sum of its proper divisors (1).

66838843 is an equidigital number, since it uses as much as digits as its factorization.

66838843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 663552, while the sum is 46.

The square root of 66838843 is about 8175.5026145186. The cubic root of 66838843 is about 405.8289033731.

The spelling of 66838843 in words is "sixty-six million, eight hundred thirty-eight thousand, eight hundred forty-three".