212755665 has 16 divisors (see below), whose sum is σ = 341251200. Its totient is φ = 113188992.

The previous prime is 212755639. The next prime is 212755679. The reversal of 212755665 is 566557212.

212755665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 212755665 - 2¹⁵ = 212722897 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11205 + ... + 23474.

It is an arithmetic number, because the mean of its divisors is an integer number (21328200).

Almost surely, 2^212755665 is an apocalyptic number.

It is an amenable number.

212755665 is a deficient number, since it is larger than the sum of its proper divisors (128495535).

212755665 is a wasteful number, since it uses less digits than its factorization.

212755665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35096.

The product of its digits is 126000, while the sum is 39.

The square root of 212755665 is about 14586.1463382211. The cubic root of 212755665 is about 596.9808191723.

The spelling of 212755665 in words is "two hundred twelve million, seven hundred fifty-five thousand, six hundred sixty-five".