216690886686611 has 2 divisors, whose sum is σ = 216690886686612. Its totient is φ = 216690886686610.

The previous prime is 216690886686551. The next prime is 216690886686647. The reversal of 216690886686611 is 116686688096612.

It is a happy number.

216690886686611 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216690886686611 - 2¹⁴ = 216690886670227 is a prime.

It is a super-2 number, since 2×216690886686611² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (216690886686011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108345443343305 + 108345443343306.

It is an arithmetic number, because the mean of its divisors is an integer number (108345443343306).

Almost surely, 2^{216690886686611} is an apocalyptic number.

216690886686611 is a deficient number, since it is larger than the sum of its proper divisors (1).

216690886686611 is an equidigital number, since it uses as much as digits as its factorization.

216690886686611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 429981696, while the sum is 74.

The spelling of 216690886686611 in words is "two hundred sixteen trillion, six hundred ninety billion, eight hundred eighty-six million, six hundred eighty-six thousand, six hundred eleven".