66380843441 has 4 divisors (see below), whose sum is σ = 72415465584. Its totient is φ = 60346221300.

The previous prime is 66380843423. The next prime is 66380843443. The reversal of 66380843441 is 14434808366.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66380843441 - 2¹⁴ = 66380827057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66380843443) 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, 3017311055 + ... + 3017311076.

It is an arithmetic number, because the mean of its divisors is an integer number (18103866396).

Almost surely, 2^66380843441 is an apocalyptic number.

It is an amenable number.

66380843441 is a deficient number, since it is larger than the sum of its proper divisors (6034622143).

66380843441 is a wasteful number, since it uses less digits than its factorization.

66380843441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6034622142.

The product of its (nonzero) digits is 1327104, while the sum is 47.

The spelling of 66380843441 in words is "sixty-six billion, three hundred eighty million, eight hundred forty-three thousand, four hundred forty-one".