997550150880 has 768 divisors, whose sum is σ = 3619370926080. Its totient is φ = 229387272192.

The previous prime is 997550150879. The next prime is 997550150887. The reversal of 997550150880 is 88051055799.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a self number, because there is not a number n which added to its sum of digits gives 997550150880.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997550150887) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 599848929 + ... + 599850591.

It is an arithmetic number, because the mean of its divisors is an integer number (4712722560).

Almost surely, 2^997550150880 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 997550150880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1809685463040).

997550150880 is an abundant number, since it is smaller than the sum of its proper divisors (2621820775200).

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

997550150880 is a wasteful number, since it uses less digits than its factorization.

997550150880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1843 (or 1835 counting only the distinct ones).

The product of its (nonzero) digits is 4536000, while the sum is 57.

The spelling of 997550150880 in words is "nine hundred ninety-seven billion, five hundred fifty million, one hundred fifty thousand, eight hundred eighty".