66432239 has 4 divisors (see below), whose sum is σ = 66463320. Its totient is φ = 66401160.

The previous prime is 66432229. The next prime is 66432241. The reversal of 66432239 is 93223466.

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 66432239 - 2¹² = 66428143 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 66432199 and 66432208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66432229) 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 3 ways as a sum of consecutive naturals, for example, 12077 + ... + 16694.

It is an arithmetic number, because the mean of its divisors is an integer number (16615830).

Almost surely, 2^66432239 is an apocalyptic number.

66432239 is a deficient number, since it is larger than the sum of its proper divisors (31081).

66432239 is a wasteful number, since it uses less digits than its factorization.

66432239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31080.

The product of its digits is 46656, while the sum is 35.

The square root of 66432239 is about 8150.5974627631. The cubic root of 66432239 is about 405.0042960475.

The spelling of 66432239 in words is "sixty-six million, four hundred thirty-two thousand, two hundred thirty-nine".