66563212 has 6 divisors (see below), whose sum is σ = 116485628. Its totient is φ = 33281604.

The previous prime is 66563179. The next prime is 66563221. The reversal of 66563212 is 21236566.

It is a super-2 number, since 2×66563212² = 8861322383513888, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8320398 + ... + 8320405.

Almost surely, 2^66563212 is an apocalyptic number.

It is an amenable number.

66563212 is a deficient number, since it is larger than the sum of its proper divisors (49922416).

66563212 is a wasteful number, since it uses less digits than its factorization.

66563212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16640807 (or 16640805 counting only the distinct ones).

The product of its digits is 12960, while the sum is 31.

The square root of 66563212 is about 8158.6280709443. The cubic root of 66563212 is about 405.2702803896.

Adding to 66563212 its reverse (21236566), we get a palindrome (87799778).

The spelling of 66563212 in words is "sixty-six million, five hundred sixty-three thousand, two hundred twelve".