65443643 has 4 divisors (see below), whose sum is σ = 65461968. Its totient is φ = 65425320.

The previous prime is 65443621. The next prime is 65443663. The reversal of 65443643 is 34634456.

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 65443643 - 2²² = 61249339 is a prime.

It is a super-2 number, since 2×65443643² = 8565740818222898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65443603) 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, 1871 + ... + 11592.

It is an arithmetic number, because the mean of its divisors is an integer number (16365492).

Almost surely, 2^65443643 is an apocalyptic number.

65443643 is a deficient number, since it is larger than the sum of its proper divisors (18325).

65443643 is a wasteful number, since it uses less digits than its factorization.

65443643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18324.

The product of its digits is 103680, while the sum is 35.

The square root of 65443643 is about 8089.7245317749. The cubic root of 65443643 is about 402.9852547932.

The spelling of 65443643 in words is "sixty-five million, four hundred forty-three thousand, six hundred forty-three".