216558862068874 has 16 divisors (see below), whose sum is σ = 349827341802120. Its totient is φ = 99949818977280.

The previous prime is 216558862068863. The next prime is 216558862068893. The reversal of 216558862068874 is 478860268855612.

It can be written as a sum of positive squares in 4 ways, for example, as 145084265378649 + 71474596690225 = 12045093^2 + 8454265^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 216558862068874.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11437287 + ... + 23747194.

Almost surely, 2^{216558862068874} is an apocalyptic number.

216558862068874 is a deficient number, since it is larger than the sum of its proper divisors (133268479733246).

216558862068874 is a wasteful number, since it uses less digits than its factorization.

216558862068874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35421225.

The product of its (nonzero) digits is 2477260800, while the sum is 76.

The spelling of 216558862068874 in words is "two hundred sixteen trillion, five hundred fifty-eight billion, eight hundred sixty-two million, sixty-eight thousand, eight hundred seventy-four".