997544040000 has 1120 divisors, whose sum is σ = 3619865272320. Its totient is φ = 241612800000.

The previous prime is 997544039993. The next prime is 997544040001. The reversal of 997544040000 is 40445799.

It is a super-2 number, since 2×997544040000² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (997544040001) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 7614839935 + ... + 7614840065.

Almost surely, 2^997544040000 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 997544040000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1809932636160).

997544040000 is an abundant number, since it is smaller than the sum of its proper divisors (2622321232320).

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

997544040000 is a wasteful number, since it uses less digits than its factorization.

997544040000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309 (or 284 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

Adding to 997544040000 its reverse (40445799), we get a palindrome (997584485799).

The spelling of 997544040000 in words is "nine hundred ninety-seven billion, five hundred forty-four million, forty thousand".