66843765 has 16 divisors (see below), whose sum is σ = 118833600. Its totient is φ = 35649936.

The previous prime is 66843743. The next prime is 66843809. The reversal of 66843765 is 56734866.

It is not a de Polignac number, because 66843765 - 2¹¹ = 66841717 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 66843765.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 247435 + ... + 247704.

It is an arithmetic number, because the mean of its divisors is an integer number (7427100).

Almost surely, 2^66843765 is an apocalyptic number.

It is an amenable number.

66843765 is a deficient number, since it is larger than the sum of its proper divisors (51989835).

66843765 is a wasteful number, since it uses less digits than its factorization.

66843765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495153 (or 495147 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The square root of 66843765 is about 8175.8036302250. The cubic root of 66843765 is about 405.8388648503.

The spelling of 66843765 in words is "sixty-six million, eight hundred forty-three thousand, seven hundred sixty-five".