65989943 has 2 divisors, whose sum is σ = 65989944. Its totient is φ = 65989942.

The previous prime is 65989939. The next prime is 65989969. The reversal of 65989943 is 34998956.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65989943 - 2² = 65989939 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65989933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32994971 + 32994972.

It is an arithmetic number, because the mean of its divisors is an integer number (32994972).

Almost surely, 2^65989943 is an apocalyptic number.

65989943 is a deficient number, since it is larger than the sum of its proper divisors (1).

65989943 is an equidigital number, since it uses as much as digits as its factorization.

65989943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2099520, while the sum is 53.

The square root of 65989943 is about 8123.4194154925. The cubic root of 65989943 is about 404.1034743777.

The spelling of 65989943 in words is "sixty-five million, nine hundred eighty-nine thousand, nine hundred forty-three".