997018198488 has 160 divisors (see below), whose sum is σ = 3023137877760. Its totient is φ = 305168186880.

The previous prime is 997018198483. The next prime is 997018198507. The reversal of 997018198488 is 884891810799.

It is a happy number.

It is a super-2 number, since 2×997018198488² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997018198483) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1299156 + ... + 1918812.

It is an arithmetic number, because the mean of its divisors is an integer number (18894611736).

Almost surely, 2^997018198488 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 997018198488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1511568938880).

997018198488 is an abundant number, since it is smaller than the sum of its proper divisors (2026119679272).

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

997018198488 is a wasteful number, since it uses less digits than its factorization.

997018198488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619879 (or 619866 counting only the distinct ones).

The product of its (nonzero) digits is 83607552, while the sum is 72.

The spelling of 997018198488 in words is "nine hundred ninety-seven billion, eighteen million, one hundred ninety-eight thousand, four hundred eighty-eight".