66212269 has 4 divisors (see below), whose sum is σ = 66243744. Its totient is φ = 66180796.

The previous prime is 66212227. The next prime is 66212273. The reversal of 66212269 is 96221266.

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 66212269 - 2¹⁹ = 65687981 is a prime.

It is a super-2 number, since 2×66212269² = 8768129132256722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66212299) 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, 12337 + ... + 16870.

It is an arithmetic number, because the mean of its divisors is an integer number (16560936).

Almost surely, 2^66212269 is an apocalyptic number.

It is an amenable number.

66212269 is a deficient number, since it is larger than the sum of its proper divisors (31475).

66212269 is a wasteful number, since it uses less digits than its factorization.

66212269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31474.

The product of its digits is 15552, while the sum is 34.

The square root of 66212269 is about 8137.0921710400. The cubic root of 66212269 is about 404.5567858842.

The spelling of 66212269 in words is "sixty-six million, two hundred twelve thousand, two hundred sixty-nine".