642066666223 has 2 divisors, whose sum is σ = 642066666224. Its totient is φ = 642066666222.

The previous prime is 642066666181. The next prime is 642066666287. The reversal of 642066666223 is 322666660246.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642066666223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642066666323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321033333111 + 321033333112.

It is an arithmetic number, because the mean of its divisors is an integer number (321033333112).

Almost surely, 2^642066666223 is an apocalyptic number.

642066666223 is a deficient number, since it is larger than the sum of its proper divisors (1).

642066666223 is an equidigital number, since it uses as much as digits as its factorization.

642066666223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4478976, while the sum is 49.

The spelling of 642066666223 in words is "six hundred forty-two billion, sixty-six million, six hundred sixty-six thousand, two hundred twenty-three".