997660335320 has 64 divisors (see below), whose sum is σ = 2478306378240. Its totient is φ = 358414652800.

The previous prime is 997660335307. The next prime is 997660335391. The reversal of 997660335320 is 23533066799.

It is a super-2 number, since 2×997660335320² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 13622576 + ... + 13695615.

It is an arithmetic number, because the mean of its divisors is an integer number (38723537160).

Almost surely, 2^997660335320 is an apocalyptic number.

It is an amenable number.

997660335320 is an abundant number, since it is smaller than the sum of its proper divisors (1480646042920).

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

997660335320 is a wasteful number, since it uses less digits than its factorization.

997660335320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27318296 (or 27318292 counting only the distinct ones).

The product of its (nonzero) digits is 5511240, while the sum is 53.

The spelling of 997660335320 in words is "nine hundred ninety-seven billion, six hundred sixty million, three hundred thirty-five thousand, three hundred twenty".