66212769 has 24 divisors (see below), whose sum is σ = 103420800. Its totient is φ = 37569504.

The previous prime is 66212761. The next prime is 66212779. The reversal of 66212769 is 96721266.

It is not a de Polignac number, because 66212769 - 2³ = 66212761 is a prime.

It is a super-2 number, since 2×66212769² = 8768261557294722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (66212761) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20392 + ... + 23414.

It is an arithmetic number, because the mean of its divisors is an integer number (4309200).

Almost surely, 2^66212769 is an apocalyptic number.

It is an amenable number.

66212769 is a deficient number, since it is larger than the sum of its proper divisors (37208031).

66212769 is a wasteful number, since it uses less digits than its factorization.

66212769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3189 (or 3182 counting only the distinct ones).

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

The square root of 66212769 is about 8137.1228944880. The cubic root of 66212769 is about 404.5578042145.

It can be divided in two parts, 662 and 12769, that added together give a palindrome (13431).

The spelling of 66212769 in words is "sixty-six million, two hundred twelve thousand, seven hundred sixty-nine".