216101565 has 12 divisors (see below), whose sum is σ = 374576124. Its totient is φ = 115254144.

The previous prime is 216101513. The next prime is 216101581. The reversal of 216101565 is 565101612.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 43599609 + 172501956 = 6603^2 + 13134^2 .

It is not a de Polignac number, because 216101565 - 2⁷ = 216101437 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2401084 + ... + 2401173.

It is an arithmetic number, because the mean of its divisors is an integer number (31214677).

Almost surely, 2^216101565 is an apocalyptic number.

It is an amenable number.

216101565 is a deficient number, since it is larger than the sum of its proper divisors (158474559).

216101565 is a wasteful number, since it uses less digits than its factorization.

216101565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4802268 (or 4802265 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 216101565 is about 14700.3933620839. The cubic root of 216101565 is about 600.0940269308.

The spelling of 216101565 in words is "two hundred sixteen million, one hundred one thousand, five hundred sixty-five".