166683881678 has 8 divisors (see below), whose sum is σ = 250027576200. Its totient is φ = 83341356280.

The previous prime is 166683881671. The next prime is 166683881699. The reversal of 166683881678 is 876188386661.

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

It is a super-2 number, since 2×166683881678² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166683881671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 324248 + ... + 662196.

It is an arithmetic number, because the mean of its divisors is an integer number (31253447025).

Almost surely, 2^166683881678 is an apocalyptic number.

166683881678 is a deficient number, since it is larger than the sum of its proper divisors (83343694522).

166683881678 is a wasteful number, since it uses less digits than its factorization.

166683881678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584562.

The product of its digits is 111476736, while the sum is 68.

The spelling of 166683881678 in words is "one hundred sixty-six billion, six hundred eighty-three million, eight hundred eighty-one thousand, six hundred seventy-eight".