216168749203691 has 2 divisors, whose sum is σ = 216168749203692. Its totient is φ = 216168749203690.

The previous prime is 216168749203657. The next prime is 216168749203697. The reversal of 216168749203691 is 196302947861612.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216168749203691 is a prime.

It is not a weakly prime, because it can be changed into another prime (216168749203697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108084374601845 + 108084374601846.

It is an arithmetic number, because the mean of its divisors is an integer number (108084374601846).

Almost surely, 2^{216168749203691} is an apocalyptic number.

216168749203691 is a deficient number, since it is larger than the sum of its proper divisors (1).

216168749203691 is an equidigital number, since it uses as much as digits as its factorization.

216168749203691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 47029248, while the sum is 65.

The spelling of 216168749203691 in words is "two hundred sixteen trillion, one hundred sixty-eight billion, seven hundred forty-nine million, two hundred three thousand, six hundred ninety-one".