999872636677 has 2 divisors, whose sum is σ = 999872636678. Its totient is φ = 999872636676.

The previous prime is 999872636627. The next prime is 999872636683. The reversal of 999872636677 is 776636278999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 686592874881 + 313279761796 = 828609^2 + 559714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999872636677 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 999872636597 and 999872636606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999872636627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499936318338 + 499936318339.

It is an arithmetic number, because the mean of its divisors is an integer number (499936318339).

Almost surely, 2^999872636677 is an apocalyptic number.

It is an amenable number.

999872636677 is a deficient number, since it is larger than the sum of its proper divisors (1).

999872636677 is an equidigital number, since it uses as much as digits as its factorization.

999872636677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592487296, while the sum is 79.

The spelling of 999872636677 in words is "nine hundred ninety-nine billion, eight hundred seventy-two million, six hundred thirty-six thousand, six hundred seventy-seven".