166314968993 has 2 divisors, whose sum is σ = 166314968994. Its totient is φ = 166314968992.

The previous prime is 166314968971. The next prime is 166314969043. The reversal of 166314968993 is 399869413661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112911456529 + 53403512464 = 336023^2 + 231092^2 .

It is an emirp because it is prime and its reverse (399869413661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166314968993 - 2²⁴ = 166298191777 is a prime.

It is a super-2 number, since 2×166314968993² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166314968903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83157484496 + 83157484497.

It is an arithmetic number, because the mean of its divisors is an integer number (83157484497).

Almost surely, 2^166314968993 is an apocalyptic number.

It is an amenable number.

166314968993 is a deficient number, since it is larger than the sum of its proper divisors (1).

166314968993 is an equidigital number, since it uses as much as digits as its factorization.

166314968993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45349632, while the sum is 65.

The spelling of 166314968993 in words is "one hundred sixty-six billion, three hundred fourteen million, nine hundred sixty-eight thousand, nine hundred ninety-three".