9918943776 has 360 divisors, whose sum is σ = 35117179020. Its totient is φ = 2735244288.

The previous prime is 9918943759. The next prime is 9918943807. The reversal of 9918943776 is 6773498199.

It can be written as a sum of positive squares in 2 ways, for example, as 9908211600 + 10732176 = 99540^2 + 3276^2 .

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 3681886 + ... + 3684578.

Almost surely, 2^9918943776 is an apocalyptic number.

9918943776 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 9918943776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17558589510).

9918943776 is an abundant number, since it is smaller than the sum of its proper divisors (25198235244).

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

9918943776 is a wasteful number, since it uses less digits than its factorization.

9918943776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2758 (or 2734 counting only the distinct ones).

The product of its digits is 20575296, while the sum is 63.

The square root of 9918943776 is about 99593.8942706831. The cubic root of 9918943776 is about 2148.5978798224.

The spelling of 9918943776 in words is "nine billion, nine hundred eighteen million, nine hundred forty-three thousand, seven hundred seventy-six".