999655403616 has 120 divisors (see below), whose sum is σ = 2949354006984. Its totient is φ = 332153602560.

The previous prime is 999655403599. The next prime is 999655403639. The reversal of 999655403616 is 616304556999.

999655403616 is a `hidden beast` number, since 9 + 9 + 9 + 6 + 5 + 5 + 4 + 0 + 3 + 616 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 195211 + ... + 1427381.

Almost surely, 2^999655403616 is an apocalyptic number.

999655403616 is a gapful number since it is divisible by the number (96) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999655403616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1474677003492).

999655403616 is an abundant number, since it is smaller than the sum of its proper divisors (1949698603368).

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

999655403616 is a wasteful number, since it uses less digits than its factorization.

999655403616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1232506 (or 1232489 counting only the distinct ones).

The product of its (nonzero) digits is 47239200, while the sum is 63.

The spelling of 999655403616 in words is "nine hundred ninety-nine billion, six hundred fifty-five million, four hundred three thousand, six hundred sixteen".