166693925321 has 16 divisors (see below), whose sum is σ = 207866053248. Its totient is φ = 129866457600.

The previous prime is 166693925309. The next prime is 166693925341. The reversal of 166693925321 is 123529396661.

It is not a de Polignac number, because 166693925321 - 2⁶ = 166693925257 is a prime.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (166693925341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201671 + ... + 611603.

It is an arithmetic number, because the mean of its divisors is an integer number (12991628328).

Almost surely, 2^166693925321 is an apocalyptic number.

166693925321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166693925321 is a deficient number, since it is larger than the sum of its proper divisors (41172127927).

166693925321 is a wasteful number, since it uses less digits than its factorization.

166693925321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415232.

The product of its digits is 3149280, while the sum is 53.

The spelling of 166693925321 in words is "one hundred sixty-six billion, six hundred ninety-three million, nine hundred twenty-five thousand, three hundred twenty-one".