990594831866 has 4 divisors (see below), whose sum is σ = 1485892247802. Its totient is φ = 495297415932.

The previous prime is 990594831827. The next prime is 990594831883. The reversal of 990594831866 is 668138495099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 668138495099 = 887 ⋅753256477.

It can be written as a sum of positive squares in only one way, i.e., 577622800225 + 412972031641 = 760015^2 + 642629^2 .

It is a junction number, because it is equal to n+sod(n) for n = 990594831796 and 990594831805.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247648707965 + ... + 247648707968.

Almost surely, 2^990594831866 is an apocalyptic number.

990594831866 is a deficient number, since it is larger than the sum of its proper divisors (495297415936).

990594831866 is a wasteful number, since it uses less digits than its factorization.

990594831866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495297415935.

The product of its (nonzero) digits is 100776960, while the sum is 68.

The spelling of 990594831866 in words is "nine hundred ninety billion, five hundred ninety-four million, eight hundred thirty-one thousand, eight hundred sixty-six".