66729023 has 4 divisors (see below), whose sum is σ = 66970200. Its totient is φ = 66487848.

The previous prime is 66728999. The next prime is 66729043. The reversal of 66729023 is 32092766.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66729023 - 2¹⁸ = 66466879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66729043) 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 3 ways as a sum of consecutive naturals, for example, 120173 + ... + 120726.

It is an arithmetic number, because the mean of its divisors is an integer number (16742550).

Almost surely, 2^66729023 is an apocalyptic number.

66729023 is a deficient number, since it is larger than the sum of its proper divisors (241177).

66729023 is a wasteful number, since it uses less digits than its factorization.

66729023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241176.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 66729023 is about 8168.7834467563. The cubic root of 66729023 is about 405.6065149145.

The spelling of 66729023 in words is "sixty-six million, seven hundred twenty-nine thousand, twenty-three".