216856658612 has 96 divisors (see below), whose sum is σ = 464483496960. Its totient is φ = 87307200000.

The previous prime is 216856658531. The next prime is 216856658713.

216856658612 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2095487 + ... + 2196537.

It is an arithmetic number, because the mean of its divisors is an integer number (4838369760).

Almost surely, 2^216856658612 is an apocalyptic number.

216856658612 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

216856658612 is an abundant number, since it is smaller than the sum of its proper divisors (247626838348).

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

216856658612 is a wasteful number, since it uses less digits than its factorization.

216856658612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101253 (or 101251 counting only the distinct ones).

The product of its digits is 8294400, while the sum is 56.

The spelling of 216856658612 in words is "two hundred sixteen billion, eight hundred fifty-six million, six hundred fifty-eight thousand, six hundred twelve".