216528203221885 has 8 divisors (see below), whose sum is σ = 262217640599640. Its totient is φ = 171633364755264.

The previous prime is 216528203221871. The next prime is 216528203221907. The reversal of 216528203221885 is 588122302825612.

It can be written as a sum of positive squares in 4 ways, for example, as 84432097425636 + 132096105796249 = 9188694^2 + 11493307^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216528203221885 - 2²³ = 216528194833277 is a prime.

It is a congruent number.

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, 198649727182 + ... + 198649728271.

It is an arithmetic number, because the mean of its divisors is an integer number (32777205074955).

Almost surely, 2^{216528203221885} is an apocalyptic number.

It is an amenable number.

216528203221885 is a deficient number, since it is larger than the sum of its proper divisors (45689437377755).

216528203221885 is a wasteful number, since it uses less digits than its factorization.

216528203221885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397299455567.

The product of its (nonzero) digits is 7372800, while the sum is 55.

The spelling of 216528203221885 in words is "two hundred sixteen trillion, five hundred twenty-eight billion, two hundred three million, two hundred twenty-one thousand, eight hundred eighty-five".