216537263 has 4 divisors (see below), whose sum is σ = 223522368. Its totient is φ = 209552160.

The previous prime is 216537259. The next prime is 216537301. The reversal of 216537263 is 362735612.

216537263 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216537263 - 2² = 216537259 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 (216537163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3492506 + ... + 3492567.

It is an arithmetic number, because the mean of its divisors is an integer number (55880592).

Almost surely, 2^216537263 is an apocalyptic number.

216537263 is a deficient number, since it is larger than the sum of its proper divisors (6985105).

216537263 is an equidigital number, since it uses as much as digits as its factorization.

216537263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6985104.

The product of its digits is 45360, while the sum is 35.

The square root of 216537263 is about 14715.2051633676. The cubic root of 216537263 is about 600.4970538561.

The spelling of 216537263 in words is "two hundred sixteen million, five hundred thirty-seven thousand, two hundred sixty-three".