216705567 has 16 divisors (see below), whose sum is σ = 311522400. Its totient is φ = 133204992.

The previous prime is 216705553. The next prime is 216705581. The reversal of 216705567 is 765507612.

It is an interprime number because it is at equal distance from previous prime (216705553) and next prime (216705581).

It is not a de Polignac number, because 216705567 - 2¹⁴ = 216689183 is a prime.

It is a super-2 number, since 2×216705567² = 93922605537582978, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216705967) 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, 38263 + ... + 43559.

It is an arithmetic number, because the mean of its divisors is an integer number (19470150).

Almost surely, 2^216705567 is an apocalyptic number.

216705567 is a deficient number, since it is larger than the sum of its proper divisors (94816833).

216705567 is a wasteful number, since it uses less digits than its factorization.

216705567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6362.

The product of its (nonzero) digits is 88200, while the sum is 39.

The square root of 216705567 is about 14720.9227631966. The cubic root of 216705567 is about 600.6525927250.

The spelling of 216705567 in words is "two hundred sixteen million, seven hundred five thousand, five hundred sixty-seven".