213635565 has 48 divisors (see below), whose sum is σ = 435052800. Its totient is φ = 95610240.

The previous prime is 213635509. The next prime is 213635579. The reversal of 213635565 is 565536312.

213635565 is a `hidden beast` number, since 2 + 13 + 635 + 5 + 6 + 5 = 666.

It is not a de Polignac number, because 213635565 - 2⁶ = 213635501 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10165 + ... + 23034.

It is an arithmetic number, because the mean of its divisors is an integer number (9063600).

Almost surely, 2^213635565 is an apocalyptic number.

It is an amenable number.

213635565 is an abundant number, since it is smaller than the sum of its proper divisors (221417235).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213635565 is a wasteful number, since it uses less digits than its factorization.

213635565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33234 (or 33231 counting only the distinct ones).

The product of its digits is 81000, while the sum is 36.

The square root of 213635565 is about 14616.2773988454. The cubic root of 213635565 is about 597.8026710660.

The spelling of 213635565 in words is "two hundred thirteen million, six hundred thirty-five thousand, five hundred sixty-five".