166643941 has 8 divisors (see below), whose sum is σ = 174589184. Its totient is φ = 158859360.

The previous prime is 166643891. The next prime is 166643951. The reversal of 166643941 is 149346661.

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

It is a cyclic number.

It is not a de Polignac number, because 166643941 - 2⁹ = 166643429 is a prime.

It is a super-2 number, since 2×166643941² = 55540406144022962, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166643894 and 166643903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166643951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38040 + ... + 42193.

It is an arithmetic number, because the mean of its divisors is an integer number (21823648).

Almost surely, 2^166643941 is an apocalyptic number.

It is an amenable number.

166643941 is a deficient number, since it is larger than the sum of its proper divisors (7945243).

166643941 is an equidigital number, since it uses as much as digits as its factorization.

166643941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80331.

The product of its digits is 93312, while the sum is 40.

The square root of 166643941 is about 12909.0642960673. The cubic root of 166643941 is about 550.2961941795.

The spelling of 166643941 in words is "one hundred sixty-six million, six hundred forty-three thousand, nine hundred forty-one".