16568618201 has 2 divisors, whose sum is σ = 16568618202. Its totient is φ = 16568618200.

The previous prime is 16568618191. The next prime is 16568618237. The reversal of 16568618201 is 10281686561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16409353801 + 159264400 = 128099^2 + 12620^2 .

It is an emirp because it is prime and its reverse (10281686561) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16568618201 is a prime.

It is not a weakly prime, because it can be changed into another prime (16568611201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8284309100 + 8284309101.

It is an arithmetic number, because the mean of its divisors is an integer number (8284309101).

Almost surely, 2^16568618201 is an apocalyptic number.

It is an amenable number.

16568618201 is a deficient number, since it is larger than the sum of its proper divisors (1).

16568618201 is an equidigital number, since it uses as much as digits as its factorization.

16568618201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 44.

The spelling of 16568618201 in words is "sixteen billion, five hundred sixty-eight million, six hundred eighteen thousand, two hundred one".