216579265218320 has 40 divisors (see below), whose sum is σ = 503556625128024. Its totient is φ = 86630014303232.

The previous prime is 216579265218269. The next prime is 216579265218397. The reversal of 216579265218320 is 23812562975612.

It can be written as a sum of positive squares in 4 ways, for example, as 30663640450576 + 185915624767744 = 5537476^2 + 13635088^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 216579265218320.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22307939 + ... + 30509058.

Almost surely, 2^{216579265218320} is an apocalyptic number.

216579265218320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216579265218320 is an abundant number, since it is smaller than the sum of its proper divisors (286977359909704).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216579265218320 is a wasteful number, since it uses less digits than its factorization.

216579265218320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52868267 (or 52868261 counting only the distinct ones).

The product of its (nonzero) digits is 21772800, while the sum is 59.

The spelling of 216579265218320 in words is "two hundred sixteen trillion, five hundred seventy-nine billion, two hundred sixty-five million, two hundred eighteen thousand, three hundred twenty".