65668239 has 80 divisors (see below), whose sum is σ = 123594240. Its totient is φ = 33825600.

The previous prime is 65668201. The next prime is 65668247. The reversal of 65668239 is 93286656.

It is a happy number.

65668239 is a `hidden beast` number, since 6 + 566 + 82 + 3 + 9 = 666.

65668239 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 65668239 - 2⁷ = 65668111 is a prime.

It is a super-2 number, since 2×65668239² = 8624635226722242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 65668194 and 65668203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65664239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 434814 + ... + 434964.

It is an arithmetic number, because the mean of its divisors is an integer number (1544928).

Almost surely, 2^65668239 is an apocalyptic number.

65668239 is a deficient number, since it is larger than the sum of its proper divisors (57926001).

65668239 is a wasteful number, since it uses less digits than its factorization.

65668239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242 (or 233 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 65668239 is about 8103.5942025746. The cubic root of 65668239 is about 403.4457300458.

The spelling of 65668239 in words is "sixty-five million, six hundred sixty-eight thousand, two hundred thirty-nine".