166565743 has 4 divisors (see below), whose sum is σ = 166680448. Its totient is φ = 166451040.

The previous prime is 166565741. The next prime is 166565753. The reversal of 166565743 is 347565661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 347565661 = 71 ⋅4895291.

It is a cyclic number.

It is not a de Polignac number, because 166565743 - 2¹ = 166565741 is a prime.

It is a super-2 number, since 2×166565743² = 55488293482284098, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166565743.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166565741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55146 + ... + 58087.

It is an arithmetic number, because the mean of its divisors is an integer number (41670112).

Almost surely, 2^166565743 is an apocalyptic number.

166565743 is a deficient number, since it is larger than the sum of its proper divisors (114705).

166565743 is a wasteful number, since it uses less digits than its factorization.

166565743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114704.

The product of its digits is 453600, while the sum is 43.

The square root of 166565743 is about 12906.0351386473. The cubic root of 166565743 is about 550.2101048518.

The spelling of 166565743 in words is "one hundred sixty-six million, five hundred sixty-five thousand, seven hundred forty-three".