65982661 has 4 divisors (see below), whose sum is σ = 69864012. Its totient is φ = 62101312.

The previous prime is 65982659. The next prime is 65982673. The reversal of 65982661 is 16628956.

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 39614436 + 26368225 = 6294^2 + 5135^2 .

It is a cyclic number.

It is not a de Polignac number, because 65982661 - 2¹ = 65982659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65982691) 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, 1940650 + ... + 1940683.

It is an arithmetic number, because the mean of its divisors is an integer number (17466003).

Almost surely, 2^65982661 is an apocalyptic number.

It is an amenable number.

65982661 is a deficient number, since it is larger than the sum of its proper divisors (3881351).

65982661 is a wasteful number, since it uses less digits than its factorization.

65982661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3881350.

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

The square root of 65982661 is about 8122.9711928579. The cubic root of 65982661 is about 404.0886095381.

The spelling of 65982661 in words is "sixty-five million, nine hundred eighty-two thousand, six hundred sixty-one".