66929697839 has 2 divisors, whose sum is σ = 66929697840. Its totient is φ = 66929697838.

The previous prime is 66929697829. The next prime is 66929697869. The reversal of 66929697839 is 93879692966.

66929697839 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66929697839 - 2²⁸ = 66661262383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66929697829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33464848919 + 33464848920.

It is an arithmetic number, because the mean of its divisors is an integer number (33464848920).

Almost surely, 2^66929697839 is an apocalyptic number.

66929697839 is a deficient number, since it is larger than the sum of its proper divisors (1).

66929697839 is an equidigital number, since it uses as much as digits as its factorization.

66929697839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 476171136, while the sum is 74.

The spelling of 66929697839 in words is "sixty-six billion, nine hundred twenty-nine million, six hundred ninety-seven thousand, eight hundred thirty-nine".