66384039 has 4 divisors (see below), whose sum is σ = 88512056. Its totient is φ = 44256024.

The previous prime is 66384029. The next prime is 66384041. The reversal of 66384039 is 93048366.

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

It is not a de Polignac number, because 66384039 - 2⁴ = 66384023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66383988 and 66384006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66384029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11064004 + ... + 11064009.

It is an arithmetic number, because the mean of its divisors is an integer number (22128014).

Almost surely, 2^66384039 is an apocalyptic number.

66384039 is a deficient number, since it is larger than the sum of its proper divisors (22128017).

66384039 is a wasteful number, since it uses less digits than its factorization.

66384039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22128016.

The product of its (nonzero) digits is 93312, while the sum is 39.

The square root of 66384039 is about 8147.6400877800. The cubic root of 66384039 is about 404.9063218787.

The spelling of 66384039 in words is "sixty-six million, three hundred eighty-four thousand, thirty-nine".