212755663 has 4 divisors (see below), whose sum is σ = 225270720. Its totient is φ = 200240608.

The previous prime is 212755639. The next prime is 212755679. The reversal of 212755663 is 366557212.

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 212755663 - 2¹⁷ = 212624591 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 (212755063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6257503 + ... + 6257536.

It is an arithmetic number, because the mean of its divisors is an integer number (56317680).

Almost surely, 2^212755663 is an apocalyptic number.

212755663 is a deficient number, since it is larger than the sum of its proper divisors (12515057).

212755663 is a wasteful number, since it uses less digits than its factorization.

212755663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12515056.

The product of its digits is 75600, while the sum is 37.

The square root of 212755663 is about 14586.1462696629. The cubic root of 212755663 is about 596.9808173016.

The spelling of 212755663 in words is "two hundred twelve million, seven hundred fifty-five thousand, six hundred sixty-three".