66666669983 has 2 divisors, whose sum is σ = 66666669984. Its totient is φ = 66666669982.

The previous prime is 66666669977. The next prime is 66666670027. The reversal of 66666669983 is 38996666666.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66666669983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66666369983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33333334991 + 33333334992.

It is an arithmetic number, because the mean of its divisors is an integer number (33333334992).

Almost surely, 2^66666669983 is an apocalyptic number.

66666669983 is a deficient number, since it is larger than the sum of its proper divisors (1).

66666669983 is an equidigital number, since it uses as much as digits as its factorization.

66666669983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544195584, while the sum is 71.

The spelling of 66666669983 in words is "sixty-six billion, six hundred sixty-six million, six hundred sixty-nine thousand, nine hundred eighty-three".