66288947443 has 4 divisors (see below), whose sum is σ = 66625439760. Its totient is φ = 65952455128.

The previous prime is 66288947423. The next prime is 66288947453. The reversal of 66288947443 is 34474988266.

It is a happy number.

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 66288947443 - 2²¹ = 66286850291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66288947423) 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 in 3 ways as a sum of consecutive naturals, for example, 168245863 + ... + 168246256.

It is an arithmetic number, because the mean of its divisors is an integer number (16656359940).

Almost surely, 2^66288947443 is an apocalyptic number.

66288947443 is a deficient number, since it is larger than the sum of its proper divisors (336492317).

66288947443 is a wasteful number, since it uses less digits than its factorization.

66288947443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336492316.

The product of its digits is 55738368, while the sum is 61.

The spelling of 66288947443 in words is "sixty-six billion, two hundred eighty-eight million, nine hundred forty-seven thousand, four hundred forty-three".