997445600000 has 432 divisors, whose sum is σ = 2621262228480. Its totient is φ = 378048000000.

The previous prime is 997445599973. The next prime is 997445600051. The reversal of 997445600000 is 6544799.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2778399821 + ... + 2778400179.

It is an arithmetic number, because the mean of its divisors is an integer number (6067736640).

Almost surely, 2^997445600000 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 997445600000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1310631114240).

997445600000 is an abundant number, since it is smaller than the sum of its proper divisors (1623816628480).

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

997445600000 is an equidigital number, since it uses as much as digits as its factorization.

997445600000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574 (or 540 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 44.

The spelling of 997445600000 in words is "nine hundred ninety-seven billion, four hundred forty-five million, six hundred thousand".