166378743 has 12 divisors (see below), whose sum is σ = 240567600. Its totient is φ = 110807136.

The previous prime is 166378741. The next prime is 166378783. The reversal of 166378743 is 347873661.

166378743 is a `hidden beast` number, since 1 + 6 + 637 + 8 + 7 + 4 + 3 = 666.

It is not a de Polignac number, because 166378743 - 2¹ = 166378741 is a prime.

It is a super-2 number, since 2×166378743² = 55363772244520098, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166378741) 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 11 ways as a sum of consecutive naturals, for example, 630 + ... + 18252.

It is an arithmetic number, because the mean of its divisors is an integer number (20047300).

Almost surely, 2^166378743 is an apocalyptic number.

166378743 is a deficient number, since it is larger than the sum of its proper divisors (74188857).

166378743 is a wasteful number, since it uses less digits than its factorization.

166378743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18678 (or 18675 counting only the distinct ones).

The product of its digits is 508032, while the sum is 45.

The square root of 166378743 is about 12898.7884314768. The cubic root of 166378743 is about 550.0041244870.

The spelling of 166378743 in words is "one hundred sixty-six million, three hundred seventy-eight thousand, seven hundred forty-three".