999998656123785 has 32 divisors (see below), whose sum is σ = 1601471329166592. Its totient is φ = 532841481319680.

The previous prime is 999998656123777. The next prime is 999998656123807. The reversal of 999998656123785 is 587321656899999.

999998656123785 is a nontrivial binomial coefficient, being equal to C(44721330, 2).

It is not a de Polignac number, because 999998656123785 - 2³ = 999998656123777 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 999998656123692 and 999998656123701.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 670074580 + ... + 671565290.

It is an arithmetic number, because the mean of its divisors is an integer number (50045979036456).

Almost surely, 2^{999998656123785} is an apocalyptic number.

999998656123785 is the 44721329-th triangular number and also the 22360665-th hexagonal number.

It is an amenable number.

999998656123785 is a deficient number, since it is larger than the sum of its proper divisors (601472673042807).

999998656123785 is a wasteful number, since it uses less digits than its factorization.

999998656123785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1531873.

The product of its digits is 142851340800, while the sum is 96.

The spelling of 999998656123785 in words is "nine hundred ninety-nine trillion, nine hundred ninety-eight billion, six hundred fifty-six million, one hundred twenty-three thousand, seven hundred eighty-five".