999981684511 has 2 divisors, whose sum is σ = 999981684512. Its totient is φ = 999981684510.

The previous prime is 999981684451. The next prime is 999981684521. The reversal of 999981684511 is 115486189999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999981684511 - 2¹¹ = 999981682463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999981684521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499990842255 + 499990842256.

It is an arithmetic number, because the mean of its divisors is an integer number (499990842256).

Almost surely, 2^999981684511 is an apocalyptic number.

999981684511 is a deficient number, since it is larger than the sum of its proper divisors (1).

999981684511 is an equidigital number, since it uses as much as digits as its factorization.

999981684511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50388480, while the sum is 70.

The spelling of 999981684511 in words is "nine hundred ninety-nine billion, nine hundred eighty-one million, six hundred eighty-four thousand, five hundred eleven".