997543510440 has 64 divisors (see below), whose sum is σ = 2992696450560. Its totient is φ = 266005743360.

The previous prime is 997543510433. The next prime is 997543510463. The reversal of 997543510440 is 44015345799.

It is a happy number.

It is a Cunningham number, because it is equal to 998771²-1.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9937782 + ... + 10037658.

It is an arithmetic number, because the mean of its divisors is an integer number (46760882040).

Almost surely, 2^997543510440 is an apocalyptic number.

It is an amenable number.

997543510440 is an abundant number, since it is smaller than the sum of its proper divisors (1995152940120).

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

997543510440 is a wasteful number, since it uses less digits than its factorization.

997543510440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183122 (or 183118 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 51.

The spelling of 997543510440 in words is "nine hundred ninety-seven billion, five hundred forty-three million, five hundred ten thousand, four hundred forty".