216778877612 has 72 divisors (see below), whose sum is σ = 430151270640. Its totient is φ = 95473065600.

The previous prime is 216778877599. The next prime is 216778877629.

216778877612 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1923314 + ... + 2032902.

Almost surely, 2^216778877612 is an apocalyptic number.

216778877612 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

216778877612 is a deficient number, since it is larger than the sum of its proper divisors (213372393028).

216778877612 is a wasteful number, since it uses less digits than its factorization.

216778877612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109743 (or 109730 counting only the distinct ones).

The product of its digits is 22127616, while the sum is 62.

The spelling of 216778877612 in words is "two hundred sixteen billion, seven hundred seventy-eight million, eight hundred seventy-seven thousand, six hundred twelve".