66511443 has 8 divisors (see below), whose sum is σ = 89804800. Its totient is φ = 43779528.

The previous prime is 66511441. The next prime is 66511453. The reversal of 66511443 is 34411566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66511443 - 2¹ = 66511441 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66511443.

It is not an unprimeable number, because it can be changed into a prime (66511441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140083 + ... + 140556.

It is an arithmetic number, because the mean of its divisors is an integer number (11225600).

Almost surely, 2^66511443 is an apocalyptic number.

66511443 is a deficient number, since it is larger than the sum of its proper divisors (23293357).

66511443 is a wasteful number, since it uses less digits than its factorization.

66511443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280721.

The product of its digits is 8640, while the sum is 30.

The square root of 66511443 is about 8155.4548003162. The cubic root of 66511443 is about 405.1651879119.

The spelling of 66511443 in words is "sixty-six million, five hundred eleven thousand, four hundred forty-three".