9897931660 has 48 divisors (see below), whose sum is σ = 20982729600. Its totient is φ = 3921813504.

The previous prime is 9897931657. The next prime is 9897931663. The reversal of 9897931660 is 661397989.

It is an interprime number because it is at equal distance from previous prime (9897931657) and next prime (9897931663).

It is a super-2 number, since 2×9897931660² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9897931595 and 9897931604.

It is not an unprimeable number, because it can be changed into a prime (9897931663) 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 15 ways as a sum of consecutive naturals, for example, 917176 + ... + 927904.

It is an arithmetic number, because the mean of its divisors is an integer number (437140200).

Almost surely, 2^9897931660 is an apocalyptic number.

It is an amenable number.

9897931660 is an abundant number, since it is smaller than the sum of its proper divisors (11084797940).

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

9897931660 is a wasteful number, since it uses less digits than its factorization.

9897931660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11170 (or 11168 counting only the distinct ones).

The product of its (nonzero) digits is 4408992, while the sum is 58.

The square root of 9897931660 is about 99488.3493681547. The cubic root of 9897931660 is about 2147.0796232511.

The spelling of 9897931660 in words is "nine billion, eight hundred ninety-seven million, nine hundred thirty-one thousand, six hundred sixty".