216663254 has 4 divisors (see below), whose sum is σ = 324994884. Its totient is φ = 108331626.

The previous prime is 216663233. The next prime is 216663257. The reversal of 216663254 is 452366612.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216663257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54165812 + ... + 54165815.

It is an arithmetic number, because the mean of its divisors is an integer number (81248721).

Almost surely, 2^216663254 is an apocalyptic number.

216663254 is a deficient number, since it is larger than the sum of its proper divisors (108331630).

216663254 is a wasteful number, since it uses less digits than its factorization.

216663254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108331629.

The product of its digits is 51840, while the sum is 35.

The square root of 216663254 is about 14719.4855209005. The cubic root of 216663254 is about 600.6134965635.

The spelling of 216663254 in words is "two hundred sixteen million, six hundred sixty-three thousand, two hundred fifty-four".