216691474612 has 6 divisors (see below), whose sum is σ = 379210080578. Its totient is φ = 108345737304.

The previous prime is 216691474609. The next prime is 216691474667. The reversal of 216691474612 is 216474196612.

216691474612 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 174946446756 + 41745027856 = 418266^2 + 204316^2 .

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 as a sum of consecutive naturals, namely, 27086434323 + ... + 27086434330.

Almost surely, 2^216691474612 is an apocalyptic number.

It is an amenable number.

216691474612 is a deficient number, since it is larger than the sum of its proper divisors (162518605966).

216691474612 is a wasteful number, since it uses less digits than its factorization.

216691474612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54172868657 (or 54172868655 counting only the distinct ones).

The product of its digits is 870912, while the sum is 49.

The spelling of 216691474612 in words is "two hundred sixteen billion, six hundred ninety-one million, four hundred seventy-four thousand, six hundred twelve".