66703723859 has 2 divisors, whose sum is σ = 66703723860. Its totient is φ = 66703723858.

The previous prime is 66703723847. The next prime is 66703723883. The reversal of 66703723859 is 95832730766.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66703723859 - 2⁴ = 66703723843 is a prime.

It is not a weakly prime, because it can be changed into another prime (66703723819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33351861929 + 33351861930.

It is an arithmetic number, because the mean of its divisors is an integer number (33351861930).

Almost surely, 2^66703723859 is an apocalyptic number.

66703723859 is a deficient number, since it is larger than the sum of its proper divisors (1).

66703723859 is an equidigital number, since it uses as much as digits as its factorization.

66703723859 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11430720, while the sum is 56.

The spelling of 66703723859 in words is "sixty-six billion, seven hundred three million, seven hundred twenty-three thousand, eight hundred fifty-nine".