9999997965180 has 144 divisors (see below), whose sum is σ = 30590725576320. Its totient is φ = 2644123607424.

The previous prime is 9999997965103. The next prime is 9999997965193. The reversal of 9999997965180 is 815697999999.

9999997965180 is a nontrivial binomial coefficient, being equal to C(4472136, 2).

It is a Harshad number since it is a multiple of its sum of digits (90).

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, 10733127 + ... + 11627553.

It is an arithmetic number, because the mean of its divisors is an integer number (212435594280).

Almost surely, 2^{9999997965180} is an apocalyptic number.

9999997965180 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

9999997965180 is the 4472135-th triangular number and also the 2236068-th hexagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9999997965180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15295362788160).

9999997965180 is an abundant number, since it is smaller than the sum of its proper divisors (20590727611140).

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

9999997965180 is a wasteful number, since it uses less digits than its factorization.

9999997965180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 894968 (or 894963 counting only the distinct ones).

The product of its (nonzero) digits is 8035387920, while the sum is 90.

The spelling of 9999997965180 in words is "nine trillion, nine hundred ninety-nine billion, nine hundred ninety-seven million, nine hundred sixty-five thousand, one hundred eighty".