998111866 has 4 divisors (see below), whose sum is σ = 1497167802. Its totient is φ = 499055932.

The previous prime is 998111839. The next prime is 998111897. The reversal of 998111866 is 668111899.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 981506241 + 16605625 = 31329^2 + 4075^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

998111866 is a strobogrammatic number because it is the same when read upside-down.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249527965 + ... + 249527968.

Almost surely, 2^998111866 is an apocalyptic number.

998111866 is a deficient number, since it is larger than the sum of its proper divisors (499055936).

998111866 is a wasteful number, since it uses less digits than its factorization.

998111866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499055935.

The product of its digits is 186624, while the sum is 49.

The square root of 998111866 is about 31592.9084764287. The cubic root of 998111866 is about 999.3702254673.

The spelling of 998111866 in words is "nine hundred ninety-eight million, one hundred eleven thousand, eight hundred sixty-six".