216997263 has 12 divisors (see below), whose sum is σ = 358217808. Its totient is φ = 123998400.

The previous prime is 216997243. The next prime is 216997283. The reversal of 216997263 is 362799612.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (216997243) and next prime (216997283).

It is not a de Polignac number, because 216997263 - 2⁸ = 216997007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216997243) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1722138 + ... + 1722263.

It is an arithmetic number, because the mean of its divisors is an integer number (29851484).

Almost surely, 2^216997263 is an apocalyptic number.

216997263 is a deficient number, since it is larger than the sum of its proper divisors (141220545).

216997263 is a wasteful number, since it uses less digits than its factorization.

216997263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3444414 (or 3444411 counting only the distinct ones).

The product of its digits is 244944, while the sum is 45.

The square root of 216997263 is about 14730.8269625300. The cubic root of 216997263 is about 600.9219742136.

The spelling of 216997263 in words is "two hundred sixteen million, nine hundred ninety-seven thousand, two hundred sixty-three".