997163315638 has 8 divisors (see below), whose sum is σ = 1709422826832. Its totient is φ = 427355706696.

The previous prime is 997163315627. The next prime is 997163315657. The reversal of 997163315638 is 836513361799.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 35612975545 + ... + 35612975572.

It is an arithmetic number, because the mean of its divisors is an integer number (213677853354).

Almost surely, 2^997163315638 is an apocalyptic number.

997163315638 is a deficient number, since it is larger than the sum of its proper divisors (712259511194).

997163315638 is a wasteful number, since it uses less digits than its factorization.

997163315638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71225951126.

The product of its digits is 22044960, while the sum is 61.

The spelling of 997163315638 in words is "nine hundred ninety-seven billion, one hundred sixty-three million, three hundred fifteen thousand, six hundred thirty-eight".