216887827860544 has 63 divisors (see below), whose sum is σ = 431566682057823. Its totient is φ = 108147427711488.

The previous prime is 216887827860527. The next prime is 216887827860547. The reversal of 216887827860544 is 445068728788612.

The square root of 216887827860544 is 14727112.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1620243860544 + 215267584000000 = 1272888^2 + 14672000^2 .

It is a super-2 number, since 2×216887827860544² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216887827860547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 46773305394 + ... + 46773310030.

Almost surely, 2^{216887827860544} is an apocalyptic number.

216887827860544 is the 14727112-nd square number.

It is an amenable number.

216887827860544 is a deficient number, since it is larger than the sum of its proper divisors (214678854197279).

216887827860544 is an frugal number, since it uses more digits than its factorization.

216887827860544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10080 (or 5036 counting only the distinct ones).

The product of its (nonzero) digits is 2312110080, while the sum is 76.

The spelling of 216887827860544 in words is "two hundred sixteen trillion, eight hundred eighty-seven billion, eight hundred twenty-seven million, eight hundred sixty thousand, five hundred forty-four".