65983381 has 4 divisors (see below), whose sum is σ = 68258700. Its totient is φ = 63708064.

The previous prime is 65983367. The next prime is 65983387. The reversal of 65983381 is 18338956.

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

It can be written as a sum of positive squares in 2 ways, for example, as 55800900 + 10182481 = 7470^2 + 3191^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65983381 is a prime.

It is a super-2 number, since 2×65983381² = 8707613136382322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65983387) 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, 1137616 + ... + 1137673.

It is an arithmetic number, because the mean of its divisors is an integer number (17064675).

Almost surely, 2^65983381 is an apocalyptic number.

It is an amenable number.

65983381 is a deficient number, since it is larger than the sum of its proper divisors (2275319).

65983381 is a wasteful number, since it uses less digits than its factorization.

65983381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2275318.

The product of its digits is 155520, while the sum is 43.

The square root of 65983381 is about 8123.0155114957. The cubic root of 65983381 is about 404.0900793320.

The spelling of 65983381 in words is "sixty-five million, nine hundred eighty-three thousand, three hundred eighty-one".