999755855280 has 1800 divisors, whose sum is σ = 4522418296704. Its totient is φ = 203793408000.

The previous prime is 999755855257. The next prime is 999755855291. The reversal of 999755855280 is 82558557999.

999755855280 is a `hidden beast` number, since 9 + 9 + 97 + 5 + 5 + 8 + 5 + 528 + 0 = 666.

999755855280 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 999755855199 and 999755855208.

It is an unprimeable number.

It is a polite number, since it can be written in 359 ways as a sum of consecutive naturals, for example, 1663486980 + ... + 1663487580.

Almost surely, 2^999755855280 is an apocalyptic number.

999755855280 is a gapful number since it is divisible by the number (90) 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 999755855280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2261209148352).

999755855280 is an abundant number, since it is smaller than the sum of its proper divisors (3522662441424).

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

999755855280 is a wasteful number, since it uses less digits than its factorization.

999755855280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697 (or 662 counting only the distinct ones).

The product of its (nonzero) digits is 408240000, while the sum is 72.

The spelling of 999755855280 in words is "nine hundred ninety-nine billion, seven hundred fifty-five million, eight hundred fifty-five thousand, two hundred eighty".