166605743 has 4 divisors (see below), whose sum is σ = 167198928. Its totient is φ = 166012560.

The previous prime is 166605739. The next prime is 166605757. The reversal of 166605743 is 347506661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 347506661 = 211 ⋅1646951.

It is a cyclic number.

It is not a de Polignac number, because 166605743 - 2² = 166605739 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166605697 and 166605706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166605773) 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, 296171 + ... + 296732.

It is an arithmetic number, because the mean of its divisors is an integer number (41799732).

Almost surely, 2^166605743 is an apocalyptic number.

166605743 is a deficient number, since it is larger than the sum of its proper divisors (593185).

166605743 is an equidigital number, since it uses as much as digits as its factorization.

166605743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593184.

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 166605743 is about 12907.5847082249. The cubic root of 166605743 is about 550.2541448053.

The spelling of 166605743 in words is "one hundred sixty-six million, six hundred five thousand, seven hundred forty-three".