999997799111 has 2 divisors, whose sum is σ = 999997799112. Its totient is φ = 999997799110.

The previous prime is 999997799069. The next prime is 999997799137. The reversal of 999997799111 is 111997799999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999997799111 - 2²² = 999993604807 is a prime.

It is a zygodrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999997799161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499998899555 + 499998899556.

It is an arithmetic number, because the mean of its divisors is an integer number (499998899556).

Almost surely, 2^999997799111 is an apocalyptic number.

999997799111 is a deficient number, since it is larger than the sum of its proper divisors (1).

999997799111 is an equidigital number, since it uses as much as digits as its factorization.

999997799111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 234365481, while the sum is 80.

The spelling of 999997799111 in words is "nine hundred ninety-nine billion, nine hundred ninety-seven million, seven hundred ninety-nine thousand, one hundred eleven".