66783723 has 16 divisors (see below), whose sum is σ = 92620800. Its totient is φ = 42751520.

The previous prime is 66783713. The next prime is 66783733. The reversal of 66783723 is 32738766.

It is an interprime number because it is at equal distance from previous prime (66783713) and next prime (66783733).

It is a cyclic number.

It is not a de Polignac number, because 66783723 - 2¹⁰ = 66782699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66783713) 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 in 15 ways as a sum of consecutive naturals, for example, 14608 + ... + 18626.

It is an arithmetic number, because the mean of its divisors is an integer number (5788800).

Almost surely, 2^66783723 is an apocalyptic number.

66783723 is a deficient number, since it is larger than the sum of its proper divisors (25837077).

66783723 is a wasteful number, since it uses less digits than its factorization.

66783723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4242.

The product of its digits is 254016, while the sum is 42.

The square root of 66783723 is about 8172.1308726672. The cubic root of 66783723 is about 405.7173143625.

It can be divided in two parts, 6678 and 3723, that added together give a palindrome (10401).

The spelling of 66783723 in words is "sixty-six million, seven hundred eighty-three thousand, seven hundred twenty-three".