997239226368 has 544 divisors, whose sum is σ = 3490976471040. Its totient is φ = 245319598080.

The previous prime is 997239226367. The next prime is 997239226381. The reversal of 997239226368 is 863622932799.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a junction number, because it is equal to n+sod(n) for n = 997239226299 and 997239226308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997239226367) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 287635771 + ... + 287639237.

It is an arithmetic number, because the mean of its divisors is an integer number (6417236160).

Almost surely, 2^997239226368 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 997239226368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1745488235520).

997239226368 is an abundant number, since it is smaller than the sum of its proper divisors (2493737244672).

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

997239226368 is a wasteful number, since it uses less digits than its factorization.

997239226368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3539 (or 3509 counting only the distinct ones).

The product of its digits is 105815808, while the sum is 66.

The spelling of 997239226368 in words is "nine hundred ninety-seven billion, two hundred thirty-nine million, two hundred twenty-six thousand, three hundred sixty-eight".