999666412 has 6 divisors (see below), whose sum is σ = 1749416228. Its totient is φ = 499833204.

The previous prime is 999666389. The next prime is 999666413. The reversal of 999666412 is 214666999.

It is a self number, because there is not a number n which added to its sum of digits gives 999666412.

It is not an unprimeable number, because it can be changed into a prime (999666413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124958298 + ... + 124958305.

Almost surely, 2^999666412 is an apocalyptic number.

It is an amenable number.

999666412 is a deficient number, since it is larger than the sum of its proper divisors (749749816).

999666412 is a wasteful number, since it uses less digits than its factorization.

999666412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249916607 (or 249916605 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 52.

The square root of 999666412 is about 31617.5016723333. The cubic root of 999666412 is about 999.8887916332. Note that the first 3 decimals are identical.

The spelling of 999666412 in words is "nine hundred ninety-nine million, six hundred sixty-six thousand, four hundred twelve".