216787637722 has 4 divisors (see below), whose sum is σ = 325181456586. Its totient is φ = 108393818860.

The previous prime is 216787637713. The next prime is 216787637743. The reversal of 216787637722 is 227736787612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 119723612121 + 97064025601 = 346011^2 + 311551^2 .

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54196909429 + ... + 54196909432.

Almost surely, 2^216787637722 is an apocalyptic number.

216787637722 is a deficient number, since it is larger than the sum of its proper divisors (108393818864).

216787637722 is a wasteful number, since it uses less digits than its factorization.

216787637722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108393818863.

The product of its digits is 16595712, while the sum is 58.

The spelling of 216787637722 in words is "two hundred sixteen billion, seven hundred eighty-seven million, six hundred thirty-seven thousand, seven hundred twenty-two".