213206656565 has 16 divisors (see below), whose sum is σ = 297914640768. Its totient is φ = 143440380096.

The previous prime is 213206656529. The next prime is 213206656567. The reversal of 213206656565 is 565656602312.

It is a cyclic number.

It is not a de Polignac number, because 213206656565 - 2¹⁴ = 213206640181 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 (213206656567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57466247 + ... + 57469956.

It is an arithmetic number, because the mean of its divisors is an integer number (18619665048).

Almost surely, 2^213206656565 is an apocalyptic number.

It is an amenable number.

213206656565 is a deficient number, since it is larger than the sum of its proper divisors (84707984203).

213206656565 is a wasteful number, since it uses less digits than its factorization.

213206656565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114936268.

The product of its (nonzero) digits is 1944000, while the sum is 47.

The spelling of 213206656565 in words is "two hundred thirteen billion, two hundred six million, six hundred fifty-six thousand, five hundred sixty-five".