66226215 has 16 divisors (see below), whose sum is σ = 115595136. Its totient is φ = 32109600.

The previous prime is 66226207. The next prime is 66226231. The reversal of 66226215 is 51262266.

66226215 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66226215 - 2³ = 66226207 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 200521 + ... + 200850.

It is an arithmetic number, because the mean of its divisors is an integer number (7224696).

Almost surely, 2^66226215 is an apocalyptic number.

66226215 is a deficient number, since it is larger than the sum of its proper divisors (49368921).

66226215 is a wasteful number, since it uses less digits than its factorization.

66226215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401390.

The product of its digits is 8640, while the sum is 30.

The square root of 66226215 is about 8137.9490659502. The cubic root of 66226215 is about 404.5851872312.

The spelling of 66226215 in words is "sixty-six million, two hundred twenty-six thousand, two hundred fifteen".