2199654779909 has 2 divisors, whose sum is σ = 2199654779910. Its totient is φ = 2199654779908.

The previous prime is 2199654779851. The next prime is 2199654780031. The reversal of 2199654779909 is 9099774569912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1477999432900 + 721655347009 = 1215730^2 + 849503^2 .

It is a cyclic number.

It is not a de Polignac number, because 2199654779909 - 2¹⁶ = 2199654714373 is a prime.

It is a super-2 number, since 2×2199654779909² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2199654779909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2199654779009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1099827389954 + 1099827389955.

It is an arithmetic number, because the mean of its divisors is an integer number (1099827389955).

Almost surely, 2^{2199654779909} is an apocalyptic number.

It is an amenable number.

2199654779909 is a deficient number, since it is larger than the sum of its proper divisors (1).

2199654779909 is an equidigital number, since it uses as much as digits as its factorization.

2199654779909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 694416240, while the sum is 77.

The spelling of 2199654779909 in words is "two trillion, one hundred ninety-nine billion, six hundred fifty-four million, seven hundred seventy-nine thousand, nine hundred nine".