16568469121 has 2 divisors, whose sum is σ = 16568469122. Its totient is φ = 16568469120.

The previous prime is 16568469107. The next prime is 16568469133. The reversal of 16568469121 is 12196486561.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8556250000 + 8012219121 = 92500^2 + 89511^2 .

It is a cyclic number.

It is not a de Polignac number, because 16568469121 - 2¹³ = 16568460929 is a prime.

It is not a weakly prime, because it can be changed into another prime (16568469101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8284234560 + 8284234561.

It is an arithmetic number, because the mean of its divisors is an integer number (8284234561).

Almost surely, 2^16568469121 is an apocalyptic number.

It is an amenable number.

16568469121 is a deficient number, since it is larger than the sum of its proper divisors (1).

16568469121 is an equidigital number, since it uses as much as digits as its factorization.

16568469121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 49.

The spelling of 16568469121 in words is "sixteen billion, five hundred sixty-eight million, four hundred sixty-nine thousand, one hundred twenty-one".