166666500650493 has 12 divisors (see below), whose sum is σ = 240740628495900. Its totient is φ = 111110941561536.

The previous prime is 166666500650459. The next prime is 166666500650509. The reversal of 166666500650493 is 394056005666661.

It can be written as a sum of positive squares in 2 ways, for example, as 12062194386489 + 154604306264004 = 3473067^2 + 12433998^2 .

It is not a de Polignac number, because 166666500650493 - 2²⁵ = 166666467096061 is a prime.

It is a super-2 number, since 2×166666500650493² (a number of 29 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 166666500650493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166666500650893) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19319683 + ... + 26581631.

It is an arithmetic number, because the mean of its divisors is an integer number (20061719041325).

Almost surely, 2^{166666500650493} is an apocalyptic number.

It is an amenable number.

166666500650493 is a deficient number, since it is larger than the sum of its proper divisors (74074127845407).

166666500650493 is a wasteful number, since it uses less digits than its factorization.

166666500650493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9812028 (or 9812025 counting only the distinct ones).

The product of its (nonzero) digits is 125971200, while the sum is 63.

The spelling of 166666500650493 in words is "one hundred sixty-six trillion, six hundred sixty-six billion, five hundred million, six hundred fifty thousand, four hundred ninety-three".