66512212 has 12 divisors (see below), whose sum is σ = 125350036. Its totient is φ = 30697920.

The previous prime is 66512197. The next prime is 66512227. The reversal of 66512212 is 21221566.

It is an interprime number because it is at equal distance from previous prime (66512197) and next prime (66512227).

It can be written as a sum of positive squares in 2 ways, for example, as 39513796 + 26998416 = 6286^2 + 5196^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 639489 + ... + 639592.

Almost surely, 2^66512212 is an apocalyptic number.

It is an amenable number.

66512212 is a deficient number, since it is larger than the sum of its proper divisors (58837824).

66512212 is a wasteful number, since it uses less digits than its factorization.

66512212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279098 (or 1279096 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 66512212 is about 8155.5019465389. The cubic root of 66512212 is about 405.1667494017.

Adding to 66512212 its reverse (21221566), we get a palindrome (87733778).

The spelling of 66512212 in words is "sixty-six million, five hundred twelve thousand, two hundred twelve".