212660663 has 4 divisors (see below), whose sum is σ = 212824680. Its totient is φ = 212496648.

The previous prime is 212660647. The next prime is 212660677. The reversal of 212660663 is 366066212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212660663 - 2⁴ = 212660647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212660363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80048 + ... + 82661.

It is an arithmetic number, because the mean of its divisors is an integer number (53206170).

Almost surely, 2^212660663 is an apocalyptic number.

212660663 is a deficient number, since it is larger than the sum of its proper divisors (164017).

212660663 is a wasteful number, since it uses less digits than its factorization.

212660663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164016.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 212660663 is about 14582.8893913381. The cubic root of 212660663 is about 596.8919491290.

The spelling of 212660663 in words is "two hundred twelve million, six hundred sixty thousand, six hundred sixty-three".