1666838333 has 2 divisors, whose sum is σ = 1666838334. Its totient is φ = 1666838332.

The previous prime is 1666838293. The next prime is 1666838353. The reversal of 1666838333 is 3338386661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1433909689 + 232928644 = 37867^2 + 15262^2 .

It is a cyclic number.

It is not a de Polignac number, because 1666838333 - 2⁶ = 1666838269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1666838353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833419166 + 833419167.

It is an arithmetic number, because the mean of its divisors is an integer number (833419167).

Almost surely, 2^1666838333 is an apocalyptic number.

It is an amenable number.

1666838333 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666838333 is an equidigital number, since it uses as much as digits as its factorization.

1666838333 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1119744, while the sum is 47.

The square root of 1666838333 is about 40826.9314668639. The cubic root of 1666838333 is about 1185.6718066880.

The spelling of 1666838333 in words is "one billion, six hundred sixty-six million, eight hundred thirty-eight thousand, three hundred thirty-three".