999889642560 has 112 divisors (see below), whose sum is σ = 3312677932416. Its totient is φ = 255044308992.

The previous prime is 999889642517. The next prime is 999889642561. The reversal of 999889642560 is 65246988999.

It is not an unprimeable number, because it can be changed into a prime (999889642561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22620349 + ... + 22664508.

Almost surely, 2^999889642560 is an apocalyptic number.

It is an amenable number.

999889642560 is an abundant number, since it is smaller than the sum of its proper divisors (2312788289856).

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

999889642560 is a wasteful number, since it uses less digits than its factorization.

999889642560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45284900 (or 45284890 counting only the distinct ones).

The product of its (nonzero) digits is 604661760, while the sum is 75.

The spelling of 999889642560 in words is "nine hundred ninety-nine billion, eight hundred eighty-nine million, six hundred forty-two thousand, five hundred sixty".