66722263 has 4 divisors (see below), whose sum is σ = 70647120. Its totient is φ = 62797408.

The previous prime is 66722213. The next prime is 66722291. The reversal of 66722263 is 36222766.

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 66722263 - 2⁹ = 66721751 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 (66722213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1962403 + ... + 1962436.

It is an arithmetic number, because the mean of its divisors is an integer number (17661780).

Almost surely, 2^66722263 is an apocalyptic number.

66722263 is a deficient number, since it is larger than the sum of its proper divisors (3924857).

66722263 is a wasteful number, since it uses less digits than its factorization.

66722263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3924856.

The product of its digits is 36288, while the sum is 34.

The square root of 66722263 is about 8168.3696659737. The cubic root of 66722263 is about 405.5928177629.

The spelling of 66722263 in words is "sixty-six million, seven hundred twenty-two thousand, two hundred sixty-three".