66843746 has 4 divisors (see below), whose sum is σ = 100265622. Its totient is φ = 33421872.

The previous prime is 66843743. The next prime is 66843809. The reversal of 66843746 is 64734866.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 60668521 + 6175225 = 7789^2 + 2485^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66843697 and 66843706.

It is not an unprimeable number, because it can be changed into a prime (66843743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16710935 + ... + 16710938.

Almost surely, 2^66843746 is an apocalyptic number.

66843746 is a deficient number, since it is larger than the sum of its proper divisors (33421876).

66843746 is a wasteful number, since it uses less digits than its factorization.

66843746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33421875.

The product of its digits is 580608, while the sum is 44.

The square root of 66843746 is about 8175.8024682596. The cubic root of 66843746 is about 405.8388263977.

The spelling of 66843746 in words is "sixty-six million, eight hundred forty-three thousand, seven hundred forty-six".