9999997056 has 192 divisors, whose sum is σ = 32948023680. Its totient is φ = 2851835904.

The previous prime is 9999997043. The next prime is 9999997069. The reversal of 9999997056 is 6507999999.

It is an interprime number because it is at equal distance from previous prime (9999997043) and next prime (9999997069).

It is a tau number, because it is divible by the number of its divisors (192).

It is a super-2 number, since 2×9999997056² (a number of 21 digits) contains 22 as substring.

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

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, 6910125 + ... + 6911571.

It is an arithmetic number, because the mean of its divisors is an integer number (171604290).

Almost surely, 2^9999997056 is an apocalyptic number.

9999997056 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 9999997056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16474011840).

9999997056 is an abundant number, since it is smaller than the sum of its proper divisors (22948026624).

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

9999997056 is a wasteful number, since it uses less digits than its factorization.

9999997056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2331 (or 2316 counting only the distinct ones).

The product of its (nonzero) digits is 111602610, while the sum is 72.

The square root of 9999997056 is about 99999.9852799989. The cubic root of 9999997056 is about 2154.4344786100.

The spelling of 9999997056 in words is "nine billion, nine hundred ninety-nine million, nine hundred ninety-seven thousand, fifty-six".