216377903966 has 32 divisors (see below), whose sum is σ = 405422641152. Its totient is φ = 84463044480.

The previous prime is 216377903897. The next prime is 216377903971. The reversal of 216377903966 is 669309773612.

It is a happy number.

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

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 15 ways as a sum of consecutive naturals, for example, 14656346 + ... + 14671101.

It is an arithmetic number, because the mean of its divisors is an integer number (12669457536).

Almost surely, 2^216377903966 is an apocalyptic number.

216377903966 is a deficient number, since it is larger than the sum of its proper divisors (189044737186).

216377903966 is a wasteful number, since it uses less digits than its factorization.

216377903966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29327504.

The product of its (nonzero) digits is 15431472, while the sum is 59.

The spelling of 216377903966 in words is "two hundred sixteen billion, three hundred seventy-seven million, nine hundred three thousand, nine hundred sixty-six".