997646323875 has 288 divisors, whose sum is σ = 1919849480640. Its totient is φ = 457909760000.

The previous prime is 997646323871. The next prime is 997646323889. The reversal of 997646323875 is 578323646799.

It is not a de Polignac number, because 997646323875 - 2² = 997646323871 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997646323871) 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 287 ways as a sum of consecutive naturals, for example, 9877686325 + ... + 9877686425.

It is an arithmetic number, because the mean of its divisors is an integer number (6666144030).

Almost surely, 2^997646323875 is an apocalyptic number.

997646323875 is a deficient number, since it is larger than the sum of its proper divisors (922203156765).

997646323875 is a wasteful number, since it uses less digits than its factorization.

997646323875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312 (or 178 counting only the distinct ones).

The product of its digits is 411505920, while the sum is 69.

The spelling of 997646323875 in words is "nine hundred ninety-seven billion, six hundred forty-six million, three hundred twenty-three thousand, eight hundred seventy-five".