216690886686609 has 12 divisors (see below), whose sum is σ = 313003570237956. Its totient is φ = 144457995985152.

The previous prime is 216690886686551. The next prime is 216690886686611. The reversal of 216690886686609 is 906686688096612.

It can be written as a sum of positive squares in 2 ways, for example, as 77943030246225 + 138747856440384 = 8828535^2 + 11779128^2 .

It is not a de Polignac number, because 216690886686609 - 2¹¹ = 216690886684561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216690886686509) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 215732712 + ... + 216734825.

It is an arithmetic number, because the mean of its divisors is an integer number (26083630853163).

Almost surely, 2^{216690886686609} is an apocalyptic number.

It is an amenable number.

216690886686609 is a deficient number, since it is larger than the sum of its proper divisors (96312683551347).

216690886686609 is a wasteful number, since it uses less digits than its factorization.

216690886686609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432523216 (or 432523213 counting only the distinct ones).

The product of its (nonzero) digits is 3869835264, while the sum is 81.

The spelling of 216690886686609 in words is "two hundred sixteen trillion, six hundred ninety billion, eight hundred eighty-six million, six hundred eighty-six thousand, six hundred nine".