997520189760 has 168 divisors, whose sum is σ = 3437068336416. Its totient is φ = 265539087360.

The previous prime is 997520189693. The next prime is 997520189797. The reversal of 997520189760 is 67981025799.

997520189760 is a `hidden beast` number, since 9 + 9 + 7 + 520 + 18 + 97 + 6 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1341187 + ... + 1947773.

Almost surely, 2^997520189760 is an apocalyptic number.

997520189760 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 997520189760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1718534168208).

997520189760 is an abundant number, since it is smaller than the sum of its proper divisors (2439548146656).

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

997520189760 is a wasteful number, since it uses less digits than its factorization.

997520189760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607181 (or 607168 counting only the distinct ones).

The product of its (nonzero) digits is 17146080, while the sum is 63.

The spelling of 997520189760 in words is "nine hundred ninety-seven billion, five hundred twenty million, one hundred eighty-nine thousand, seven hundred sixty".