997798461597 has 24 divisors (see below), whose sum is σ = 1647185641920. Its totient is φ = 570161453760.

The previous prime is 997798461511. The next prime is 997798461599. The reversal of 997798461597 is 795164897799.

It is not a de Polignac number, because 997798461597 - 2¹⁵ = 997798428829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997798461599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7196554 + ... + 7333892.

It is an arithmetic number, because the mean of its divisors is an integer number (68632735080).

Almost surely, 2^997798461597 is an apocalyptic number.

It is an amenable number.

997798461597 is a deficient number, since it is larger than the sum of its proper divisors (649387180323).

997798461597 is a wasteful number, since it uses less digits than its factorization.

997798461597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252673 (or 252670 counting only the distinct ones).

The product of its digits is 2160406080, while the sum is 81.

The spelling of 997798461597 in words is "nine hundred ninety-seven billion, seven hundred ninety-eight million, four hundred sixty-one thousand, five hundred ninety-seven".