999647306560 has 336 divisors, whose sum is σ = 2820965330880. Its totient is φ = 336357826560.

The previous prime is 999647306521. The next prime is 999647306573. The reversal of 999647306560 is 65603746999.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a junction number, because it is equal to n+sod(n) for n = 999647306492 and 999647306501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 241516971 + ... + 241521109.

Almost surely, 2^999647306560 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999647306560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1410482665440).

999647306560 is an abundant number, since it is smaller than the sum of its proper divisors (1821318024320).

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

999647306560 is a wasteful number, since it uses less digits than its factorization.

999647306560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4454 (or 4437 counting only the distinct ones).

The product of its (nonzero) digits is 66134880, while the sum is 64.

The spelling of 999647306560 in words is "nine hundred ninety-nine billion, six hundred forty-seven million, three hundred six thousand, five hundred sixty".