66226791 has 4 divisors (see below), whose sum is σ = 88302392. Its totient is φ = 44151192.

The previous prime is 66226789. The next prime is 66226793. The reversal of 66226791 is 19762266.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (66226789) and next prime (66226793).

It is not a de Polignac number, because 66226791 - 2¹ = 66226789 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 (66226793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11037796 + ... + 11037801.

It is an arithmetic number, because the mean of its divisors is an integer number (22075598).

Almost surely, 2^66226791 is an apocalyptic number.

66226791 is a deficient number, since it is larger than the sum of its proper divisors (22075601).

66226791 is a wasteful number, since it uses less digits than its factorization.

66226791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22075600.

The product of its digits is 54432, while the sum is 39.

The square root of 66226791 is about 8137.9844556254. The cubic root of 66226791 is about 404.5863601825.

The spelling of 66226791 in words is "sixty-six million, two hundred twenty-six thousand, seven hundred ninety-one".