166739943 has 4 divisors (see below), whose sum is σ = 222319928. Its totient is φ = 111159960.

The previous prime is 166739941. The next prime is 166739971. The reversal of 166739943 is 349937661.

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

It is not a de Polignac number, because 166739943 - 2¹ = 166739941 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166739892 and 166739901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166739941) 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, 27789988 + ... + 27789993.

It is an arithmetic number, because the mean of its divisors is an integer number (55579982).

Almost surely, 2^166739943 is an apocalyptic number.

166739943 is a deficient number, since it is larger than the sum of its proper divisors (55579985).

166739943 is an equidigital number, since it uses as much as digits as its factorization.

166739943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55579984.

The product of its digits is 734832, while the sum is 48.

The square root of 166739943 is about 12912.7821556781. The cubic root of 166739943 is about 550.4018473729.

The spelling of 166739943 in words is "one hundred sixty-six million, seven hundred thirty-nine thousand, nine hundred forty-three".