216996663 has 32 divisors (see below), whose sum is σ = 331475200. Its totient is φ = 125162496.

The previous prime is 216996643. The next prime is 216996667. The reversal of 216996663 is 366699612.

It is a happy number.

It is not a de Polignac number, because 216996663 - 2⁶ = 216996599 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 (216996667) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 70368 + ... + 73386.

It is an arithmetic number, because the mean of its divisors is an integer number (10358600).

Almost surely, 2^216996663 is an apocalyptic number.

216996663 is a deficient number, since it is larger than the sum of its proper divisors (114478537).

216996663 is a wasteful number, since it uses less digits than its factorization.

216996663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3151.

The product of its digits is 629856, while the sum is 48.

The square root of 216996663 is about 14730.8065970605. The cubic root of 216996663 is about 600.9214203610.

The spelling of 216996663 in words is "two hundred sixteen million, nine hundred ninety-six thousand, six hundred sixty-three".