999999986666377 has 2 divisors, whose sum is σ = 999999986666378. Its totient is φ = 999999986666376.

The previous prime is 999999986666357. The next prime is 999999986666431. The reversal of 999999986666377 is 773666689999999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 817059862579081 + 182940124087296 = 28584259^2 + 13525536^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999999986666377 is a prime.

It is a super-3 number, since 3×999999986666377³ (a number of 46 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (999999986666347) 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, 499999993333188 + 499999993333189.

It is an arithmetic number, because the mean of its divisors is an integer number (499999993333189).

Almost surely, 2^{999999986666377} is an apocalyptic number.

It is an amenable number.

999999986666377 is a deficient number, since it is larger than the sum of its proper divisors (1).

999999986666377 is an equidigital number, since it uses as much as digits as its factorization.

999999986666377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7289703921024, while the sum is 112.

The spelling of 999999986666377 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred eighty-six million, six hundred sixty-six thousand, three hundred seventy-seven".