216690886686551 has 2 divisors, whose sum is σ = 216690886686552. Its totient is φ = 216690886686550.

The previous prime is 216690886686541. The next prime is 216690886686611. The reversal of 216690886686551 is 155686688096612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216690886686551 - 2³⁰ = 216689812944727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216690886686541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108345443343275 + 108345443343276.

It is an arithmetic number, because the mean of its divisors is an integer number (108345443343276).

Almost surely, 2^{216690886686551} is an apocalyptic number.

216690886686551 is a deficient number, since it is larger than the sum of its proper divisors (1).

216690886686551 is an equidigital number, since it uses as much as digits as its factorization.

216690886686551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1791590400, while the sum is 77.

The spelling of 216690886686551 in words is "two hundred sixteen trillion, six hundred ninety billion, eight hundred eighty-six million, six hundred eighty-six thousand, five hundred fifty-one".