999649286400 has 216 divisors, whose sum is σ = 3493113863904. Its totient is φ = 250892288000.

The previous prime is 999649286381. The next prime is 999649286413. The reversal of 999649286400 is 4682946999.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1204926 + ... + 1857725.

It is an arithmetic number, because the mean of its divisors is an integer number (16171823444).

Almost surely, 2^999649286400 is an apocalyptic number.

It is an amenable number.

999649286400 is an abundant number, since it is smaller than the sum of its proper divisors (2493464577504).

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

999649286400 is a wasteful number, since it uses less digits than its factorization.

999649286400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3062697 (or 3062678 counting only the distinct ones).

The product of its (nonzero) digits is 60466176, while the sum is 66.

The spelling of 999649286400 in words is "nine hundred ninety-nine billion, six hundred forty-nine million, two hundred eighty-six thousand, four hundred".