999911888116657 has 2 divisors, whose sum is σ = 999911888116658. Its totient is φ = 999911888116656.

The previous prime is 999911888116649. The next prime is 999911888116681. The reversal of 999911888116657 is 756611888119999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 713988273272481 + 285923614844176 = 26720559^2 + 16909276^2 .

It is a cyclic number.

It is not a de Polignac number, because 999911888116657 - 2³ = 999911888116649 is a prime.

It is not a weakly prime, because it can be changed into another prime (999911888119657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499955944058328 + 499955944058329.

It is an arithmetic number, because the mean of its divisors is an integer number (499955944058329).

Almost surely, 2^{999911888116657} is an apocalyptic number.

It is an amenable number.

999911888116657 is a deficient number, since it is larger than the sum of its proper divisors (1).

999911888116657 is an equidigital number, since it uses as much as digits as its factorization.

999911888116657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4232632320, while the sum is 88.

The spelling of 999911888116657 in words is "nine hundred ninety-nine trillion, nine hundred eleven billion, eight hundred eighty-eight million, one hundred sixteen thousand, six hundred fifty-seven".