66226665 has 16 divisors (see below), whose sum is σ = 108427968. Its totient is φ = 34499136.

The previous prime is 66226651. The next prime is 66226697. The reversal of 66226665 is 56662266.

It is not a de Polignac number, because 66226665 - 2⁸ = 66226409 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50694 + ... + 51983.

It is an arithmetic number, because the mean of its divisors is an integer number (6776748).

Almost surely, 2^66226665 is an apocalyptic number.

It is an amenable number.

66226665 is a deficient number, since it is larger than the sum of its proper divisors (42201303).

66226665 is a wasteful number, since it uses less digits than its factorization.

66226665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102728.

The product of its digits is 155520, while the sum is 39.

The square root of 66226665 is about 8137.9767141471. The cubic root of 66226665 is about 404.5861036000.

The spelling of 66226665 in words is "sixty-six million, two hundred twenty-six thousand, six hundred sixty-five".