999997555311611 has 2 divisors, whose sum is σ = 999997555311612. Its totient is φ = 999997555311610.

The previous prime is 999997555311529. The next prime is 999997555311647. The reversal of 999997555311611 is 116113555799999.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999997555311611 is a prime.

It is a super-2 number, since 2×999997555311611² (a number of 31 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (999997555301611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499998777655805 + 499998777655806.

It is an arithmetic number, because the mean of its divisors is an integer number (499998777655806).

Almost surely, 2^{999997555311611} is an apocalyptic number.

999997555311611 is a deficient number, since it is larger than the sum of its proper divisors (1).

999997555311611 is an equidigital number, since it uses as much as digits as its factorization.

999997555311611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 930021750, while the sum is 80.

The spelling of 999997555311611 in words is "nine hundred ninety-nine trillion, nine hundred ninety-seven billion, five hundred fifty-five million, three hundred eleven thousand, six hundred eleven".