999617717911 has 2 divisors, whose sum is σ = 999617717912. Its totient is φ = 999617717910.

The previous prime is 999617717899. The next prime is 999617717951. The reversal of 999617717911 is 119717716999.

999617717911 = T₈₁₆₃₃₉ + T₈₁₆₃₄₀ + T₈₁₆₃₄₁.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999617717911 - 2⁷ = 999617717783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999617717951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499808858955 + 499808858956.

It is an arithmetic number, because the mean of its divisors is an integer number (499808858956).

Almost surely, 2^999617717911 is an apocalyptic number.

999617717911 is the 816341-st centered triangular number.

999617717911 is a deficient number, since it is larger than the sum of its proper divisors (1).

999617717911 is an equidigital number, since it uses as much as digits as its factorization.

999617717911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13502538, while the sum is 67.

The spelling of 999617717911 in words is "nine hundred ninety-nine billion, six hundred seventeen million, seven hundred seventeen thousand, nine hundred eleven".