66982439 has 4 divisors (see below), whose sum is σ = 67010256. Its totient is φ = 66954624.

The previous prime is 66982427. The next prime is 66982483. The reversal of 66982439 is 93428966.

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 66982439 - 2¹² = 66978343 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66982393 and 66982402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66984439) 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, 9914 + ... + 15239.

It is an arithmetic number, because the mean of its divisors is an integer number (16752564).

Almost surely, 2^66982439 is an apocalyptic number.

66982439 is a deficient number, since it is larger than the sum of its proper divisors (27817).

66982439 is a wasteful number, since it uses less digits than its factorization.

66982439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27816.

The product of its digits is 559872, while the sum is 47.

The square root of 66982439 is about 8184.2799927666. The cubic root of 66982439 is about 406.1193219458.

The spelling of 66982439 in words is "sixty-six million, nine hundred eighty-two thousand, four hundred thirty-nine".