66380843445 has 32 divisors (see below), whose sum is σ = 121457031168. Its totient is φ = 30326799168.

The previous prime is 66380843443. The next prime is 66380843497. The reversal of 66380843445 is 54434808366.

It is a happy number.

It is not a de Polignac number, because 66380843445 - 2¹ = 66380843443 is a prime.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 23449 + ... + 365118.

It is an arithmetic number, because the mean of its divisors is an integer number (3795532224).

Almost surely, 2^66380843445 is an apocalyptic number.

It is an amenable number.

66380843445 is a deficient number, since it is larger than the sum of its proper divisors (55076187723).

66380843445 is a wasteful number, since it uses less digits than its factorization.

66380843445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390209.

The product of its (nonzero) digits is 6635520, while the sum is 51.

The spelling of 66380843445 in words is "sixty-six billion, three hundred eighty million, eight hundred forty-three thousand, four hundred forty-five".