166799639999 has 8 divisors (see below), whose sum is σ = 175582429440. Its totient is φ = 158017236696.

The previous prime is 166799639987. The next prime is 166799640013. The reversal of 166799639999 is 999936997661.

It is a happy number.

166799639999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166799639999 - 2⁴ = 166799639983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166799639969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1333352 + ... + 1453074.

It is an arithmetic number, because the mean of its divisors is an integer number (21947803680).

Almost surely, 2^166799639999 is an apocalyptic number.

166799639999 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

166799639999 is a deficient number, since it is larger than the sum of its proper divisors (8782789441).

166799639999 is a wasteful number, since it uses less digits than its factorization.

166799639999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193069.

The product of its digits is 2410616376, while the sum is 83.

The spelling of 166799639999 in words is "one hundred sixty-six billion, seven hundred ninety-nine million, six hundred thirty-nine thousand, nine hundred ninety-nine".