999999626999909 has 2 divisors, whose sum is σ = 999999626999910. Its totient is φ = 999999626999908.

The previous prime is 999999626999873. The next prime is 999999626999917. The reversal of 999999626999909 is 909999626999999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 854528649511684 + 145470977488225 = 29232322^2 + 12061135^2 .

It is a cyclic number.

It is not a de Polignac number, because 999999626999909 - 2⁴⁸ = 718524650289253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 999999626999794 and 999999626999803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999999626999929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999813499954 + 499999813499955.

It is an arithmetic number, because the mean of its divisors is an integer number (499999813499955).

Almost surely, 2^{999999626999909} is an apocalyptic number.

It is an amenable number.

999999626999909 is a deficient number, since it is larger than the sum of its proper divisors (1).

999999626999909 is an equidigital number, since it uses as much as digits as its factorization.

999999626999909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2259436291848, while the sum is 113.

The spelling of 999999626999909 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, six hundred twenty-six million, nine hundred ninety-nine thousand, nine hundred nine".