997846738581 has 192 divisors, whose sum is σ = 1779212288000. Its totient is φ = 485558789760.

The previous prime is 997846738519. The next prime is 997846738591. The reversal of 997846738581 is 185837648799.

It is not a de Polignac number, because 997846738581 - 2⁹ = 997846738069 is a prime.

It is a super-2 number, since 2×997846738581² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997846738591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 2718928260 + ... + 2718928626.

Almost surely, 2^997846738581 is an apocalyptic number.

It is an amenable number.

997846738581 is a deficient number, since it is larger than the sum of its proper divisors (781365549419).

997846738581 is a wasteful number, since it uses less digits than its factorization.

997846738581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900 (or 889 counting only the distinct ones).

The product of its digits is 731566080, while the sum is 75.

The spelling of 997846738581 in words is "nine hundred ninety-seven billion, eight hundred forty-six million, seven hundred thirty-eight thousand, five hundred eighty-one".