166708799993 has 2 divisors, whose sum is σ = 166708799994. Its totient is φ = 166708799992.

The previous prime is 166708799981. The next prime is 166708800053. The reversal of 166708799993 is 399997807661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140109473344 + 26599326649 = 374312^2 + 163093^2 .

It is a cyclic number.

It is not a de Polignac number, because 166708799993 - 2²² = 166704605689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166708799993.

It is not a weakly prime, because it can be changed into another prime (166708799953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83354399996 + 83354399997.

It is an arithmetic number, because the mean of its divisors is an integer number (83354399997).

Almost surely, 2^166708799993 is an apocalyptic number.

It is an amenable number.

166708799993 is a deficient number, since it is larger than the sum of its proper divisors (1).

166708799993 is an equidigital number, since it uses as much as digits as its factorization.

166708799993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 277766496, while the sum is 74.

The spelling of 166708799993 in words is "one hundred sixty-six billion, seven hundred eight million, seven hundred ninety-nine thousand, nine hundred ninety-three".