66448222213 has 4 divisors (see below), whose sum is σ = 67093350688. Its totient is φ = 65803093740.

The previous prime is 66448222157. The next prime is 66448222229. The reversal of 66448222213 is 31222284466.

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 66448222213 - 2³³ = 57858287621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66448222273) 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, 322564083 + ... + 322564288.

It is an arithmetic number, because the mean of its divisors is an integer number (16773337672).

Almost surely, 2^66448222213 is an apocalyptic number.

It is an amenable number.

66448222213 is a deficient number, since it is larger than the sum of its proper divisors (645128475).

66448222213 is a wasteful number, since it uses less digits than its factorization.

66448222213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645128474.

The product of its digits is 221184, while the sum is 40.

The spelling of 66448222213 in words is "sixty-six billion, four hundred forty-eight million, two hundred twenty-two thousand, two hundred thirteen".