166621664306 has 8 divisors (see below), whose sum is σ = 250348359324. Its totient is φ = 83172211200.

The previous prime is 166621664281. The next prime is 166621664317. The reversal of 166621664306 is 603466126661.

166621664306 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 155224180225 + 11397484081 = 393985^2 + 106759^2 .

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

It is a super-2 number, since 2×166621664306² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 69308975 + ... + 69311378.

Almost surely, 2^166621664306 is an apocalyptic number.

166621664306 is a deficient number, since it is larger than the sum of its proper divisors (83726695018).

166621664306 is a wasteful number, since it uses less digits than its factorization.

166621664306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138620956.

The product of its (nonzero) digits is 1119744, while the sum is 47.

The spelling of 166621664306 in words is "one hundred sixty-six billion, six hundred twenty-one million, six hundred sixty-four thousand, three hundred six".