66212771 has 12 divisors (see below), whose sum is σ = 69213144. Its totient is φ = 63336000.

The previous prime is 66212761. The next prime is 66212779. The reversal of 66212771 is 17721266.

It is a de Polignac number, because none of the positive numbers 2^k-66212771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66212779) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109871 + ... + 110471.

It is an arithmetic number, because the mean of its divisors is an integer number (5767762).

Almost surely, 2^66212771 is an apocalyptic number.

66212771 is a deficient number, since it is larger than the sum of its proper divisors (3000373).

66212771 is a wasteful number, since it uses less digits than its factorization.

66212771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790 (or 761 counting only the distinct ones).

The product of its digits is 7056, while the sum is 32.

The square root of 66212771 is about 8137.1230173815. The cubic root of 66212771 is about 404.5578082879.

The spelling of 66212771 in words is "sixty-six million, two hundred twelve thousand, seven hundred seventy-one".