66213012 has 12 divisors (see below), whose sum is σ = 154497056. Its totient is φ = 22071000.

The previous prime is 66212957. The next prime is 66213029. The reversal of 66213012 is 21031266.

It is a happy number.

66213012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×66213012² = 8768325916224288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66213012.

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 3 ways as a sum of consecutive naturals, for example, 2758864 + ... + 2758887.

Almost surely, 2^66213012 is an apocalyptic number.

It is an amenable number.

66213012 is an abundant number, since it is smaller than the sum of its proper divisors (88284044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66213012 is a wasteful number, since it uses less digits than its factorization.

66213012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5517758 (or 5517756 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 66213012 is about 8137.1378260418. The cubic root of 66213012 is about 404.5582991212.

Adding to 66213012 its reverse (21031266), we get a palindrome (87244278).

The spelling of 66213012 in words is "sixty-six million, two hundred thirteen thousand, twelve".