213546665 has 16 divisors (see below), whose sum is σ = 264893760. Its totient is φ = 165174720.

The previous prime is 213546659. The next prime is 213546703. The reversal of 213546665 is 566645312.

It is a happy number.

It is not a de Polignac number, because 213546665 - 2¹² = 213542569 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, 12062 + ... + 23928.

It is an arithmetic number, because the mean of its divisors is an integer number (16555860).

Almost surely, 2^213546665 is an apocalyptic number.

It is an amenable number.

213546665 is a deficient number, since it is larger than the sum of its proper divisors (51347095).

213546665 is a wasteful number, since it uses less digits than its factorization.

213546665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11992.

The product of its digits is 129600, while the sum is 38.

The square root of 213546665 is about 14613.2359523823. The cubic root of 213546665 is about 597.7197385093.

The spelling of 213546665 in words is "two hundred thirteen million, five hundred forty-six thousand, six hundred sixty-five".