999999986666677 has 2 divisors, whose sum is σ = 999999986666678. Its totient is φ = 999999986666676.

The previous prime is 999999986666623. The next prime is 999999986666741. The reversal of 999999986666677 is 776666689999999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 962691235434756 + 37308751231921 = 31027266^2 + 6108089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999999986666677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999999986666377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999993333338 + 499999993333339.

It is an arithmetic number, because the mean of its divisors is an integer number (499999993333339).

Almost surely, 2^{999999986666677} is an apocalyptic number.

It is an amenable number.

999999986666677 is a deficient number, since it is larger than the sum of its proper divisors (1).

999999986666677 is an equidigital number, since it uses as much as digits as its factorization.

999999986666677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14579407842048, while the sum is 115.

The spelling of 999999986666677 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred eighty-six million, six hundred sixty-six thousand, six hundred seventy-seven".