997804080000 has 1920 divisors, whose sum is σ = 4489890525120. Its totient is φ = 207028224000.

The previous prime is 997804079891. The next prime is 997804080019. The reversal of 997804080000 is 80408799.

It is a tau number, because it is divible by the number of its divisors (1920).

It is a super-2 number, since 2×997804080000² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 6355439922 + ... + 6355440078.

Almost surely, 2^997804080000 is an apocalyptic number.

997804080000 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 997804080000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2244945262560).

997804080000 is an abundant number, since it is smaller than the sum of its proper divisors (3492086445120).

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

997804080000 is a wasteful number, since it uses less digits than its factorization.

997804080000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314 (or 284 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

Adding to 997804080000 its reverse (80408799), we get a palindrome (997884488799).

The spelling of 997804080000 in words is "nine hundred ninety-seven billion, eight hundred four million, eighty thousand".