166663943 has 4 divisors (see below), whose sum is σ = 168193080. Its totient is φ = 165134808.

The previous prime is 166663933. The next prime is 166663951. The reversal of 166663943 is 349366661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166663943 - 2¹² = 166659847 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166663894 and 166663903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166663933) 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, 764405 + ... + 764622.

It is an arithmetic number, because the mean of its divisors is an integer number (42048270).

Almost surely, 2^166663943 is an apocalyptic number.

166663943 is a deficient number, since it is larger than the sum of its proper divisors (1529137).

166663943 is a wasteful number, since it uses less digits than its factorization.

166663943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1529136.

The product of its digits is 419904, while the sum is 44.

The square root of 166663943 is about 12909.8389997707. The cubic root of 166663943 is about 550.3182103497.

The spelling of 166663943 in words is "one hundred sixty-six million, six hundred sixty-three thousand, nine hundred forty-three".