19664063 has 2 divisors, whose sum is σ = 19664064. Its totient is φ = 19664062.

The previous prime is 19664009. The next prime is 19664081. The reversal of 19664063 is 36046691.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19664063 - 2⁶ = 19663999 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 (19664003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9832031 + 9832032.

It is an arithmetic number, because the mean of its divisors is an integer number (9832032).

Almost surely, 2^19664063 is an apocalyptic number.

19664063 is a deficient number, since it is larger than the sum of its proper divisors (1).

19664063 is an equidigital number, since it uses as much as digits as its factorization.

19664063 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 19664063 is about 4434.4180001439. The cubic root of 19664063 is about 269.9133832815.

The spelling of 19664063 in words is "nineteen million, six hundred sixty-four thousand, sixty-three".