999999654111611 has 2 divisors, whose sum is σ = 999999654111612. Its totient is φ = 999999654111610.

The previous prime is 999999654111571. The next prime is 999999654111649. The reversal of 999999654111611 is 116111456999999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999999654111611 - 2¹⁸ = 999999653849467 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (999999654114611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999827055805 + 499999827055806.

It is an arithmetic number, because the mean of its divisors is an integer number (499999827055806).

Almost surely, 2^{999999654111611} is an apocalyptic number.

999999654111611 is a deficient number, since it is larger than the sum of its proper divisors (1).

999999654111611 is an equidigital number, since it uses as much as digits as its factorization.

999999654111611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 382637520, while the sum is 80.

The spelling of 999999654111611 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, six hundred fifty-four million, one hundred eleven thousand, six hundred eleven".