216552180868 has 6 divisors (see below), whose sum is σ = 378966316526. Its totient is φ = 108276090432.

The previous prime is 216552180829. The next prime is 216552180893. The reversal of 216552180868 is 868081255612.

It can be written as a sum of positive squares in only one way, i.e., 198914216004 + 17637964864 = 445998^2 + 132808^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27069022605 + ... + 27069022612.

Almost surely, 2^216552180868 is an apocalyptic number.

It is an amenable number.

216552180868 is a deficient number, since it is larger than the sum of its proper divisors (162414135658).

216552180868 is a wasteful number, since it uses less digits than its factorization.

216552180868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54138045221 (or 54138045219 counting only the distinct ones).

The product of its (nonzero) digits is 1843200, while the sum is 52.

The spelling of 216552180868 in words is "two hundred sixteen billion, five hundred fifty-two million, one hundred eighty thousand, eight hundred sixty-eight".