899940666 has 16 divisors (see below), whose sum is σ = 1822665600. Its totient is φ = 296182848.

The previous prime is 899940661. The next prime is 899940667. The reversal of 899940666 is 666049998.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (899940661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 948831 + ... + 949778.

It is an arithmetic number, because the mean of its divisors is an integer number (113916600).

Almost surely, 2^899940666 is an apocalyptic number.

899940666 is an abundant number, since it is smaller than the sum of its proper divisors (922724934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

899940666 is a wasteful number, since it uses less digits than its factorization.

899940666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1898693.

The product of its (nonzero) digits is 5038848, while the sum is 57.

The square root of 899940666 is about 29999.0110837007. The cubic root of 899940666 is about 965.4681669737.

The spelling of 899940666 in words is "eight hundred ninety-nine million, nine hundred forty thousand, six hundred sixty-six".