999997538090860 has 288 divisors, whose sum is σ = 2271438604512000. Its totient is φ = 369687992094720.

The previous prime is 999997538090753. The next prime is 999997538090923. The reversal of 999997538090860 is 68090835799999.

999997538090860 is a nontrivial binomial coefficient, being equal to C(44721305, 2).

It is a super-2 number, since 2×999997538090860² (a number of 31 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 32311126666 + ... + 32311157614.

It is an arithmetic number, because the mean of its divisors is an integer number (7886939599000).

Almost surely, 2^{999997538090860} is an apocalyptic number.

999997538090860 is the 44721304-th triangular number.

999997538090860 is the 14907102-nd centered nonagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999997538090860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1135719302256000).

999997538090860 is an abundant number, since it is smaller than the sum of its proper divisors (1271441066421140).

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

999997538090860 is a wasteful number, since it uses less digits than its factorization.

999997538090860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31569 (or 31550 counting only the distinct ones).

The product of its (nonzero) digits is 21427701120, while the sum is 91.

The spelling of 999997538090860 in words is "nine hundred ninety-nine trillion, nine hundred ninety-seven billion, five hundred thirty-eight million, ninety thousand, eight hundred sixty".