66219147 has 8 divisors (see below), whose sum is σ = 98102480. Its totient is φ = 44146080.

The previous prime is 66219133. The next prime is 66219149. The reversal of 66219147 is 74191266.

It is not a de Polignac number, because 66219147 - 2²² = 62024843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66219149) 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, 1226254 + ... + 1226307.

It is an arithmetic number, because the mean of its divisors is an integer number (12262810).

Almost surely, 2^66219147 is an apocalyptic number.

66219147 is a deficient number, since it is larger than the sum of its proper divisors (31883333).

66219147 is a wasteful number, since it uses less digits than its factorization.

66219147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2452570 (or 2452564 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 66219147 is about 8137.5147926133. The cubic root of 66219147 is about 404.5707935864.

It can be divided in two parts, 66219 and 147, that added together give a palindrome (66366).

The spelling of 66219147 in words is "sixty-six million, two hundred nineteen thousand, one hundred forty-seven".