216716668 has 24 divisors (see below), whose sum is σ = 433786752. Its totient is φ = 92802864.

The previous prime is 216716657. The next prime is 216716683. The reversal of 216716668 is 866617612.

It is a happy number.

It is a super-2 number, since 2×216716668² = 93932228378044448, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44355 + ... + 48997.

It is an arithmetic number, because the mean of its divisors is an integer number (18074448).

Almost surely, 2^216716668 is an apocalyptic number.

216716668 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

216716668 is an abundant number, since it is smaller than the sum of its proper divisors (217070084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216716668 is a wasteful number, since it uses less digits than its factorization.

216716668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6321 (or 6319 counting only the distinct ones).

The product of its digits is 145152, while the sum is 43.

The square root of 216716668 is about 14721.2998067426. The cubic root of 216716668 is about 600.6628489306.

The spelling of 216716668 in words is "two hundred sixteen million, seven hundred sixteen thousand, six hundred sixty-eight".