217668730312 has 16 divisors (see below), whose sum is σ = 445231494000. Its totient is φ = 98940331920.

The previous prime is 217668730271. The next prime is 217668730333. The reversal of 217668730312 is 213037866712.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1236754062 + ... + 1236754237.

It is an arithmetic number, because the mean of its divisors is an integer number (27826968375).

Almost surely, 2^217668730312 is an apocalyptic number.

217668730312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

217668730312 is an abundant number, since it is smaller than the sum of its proper divisors (227562763688).

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

217668730312 is a wasteful number, since it uses less digits than its factorization.

217668730312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2473508316 (or 2473508312 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 46.

The spelling of 217668730312 in words is "two hundred seventeen billion, six hundred sixty-eight million, seven hundred thirty thousand, three hundred twelve".