997695660 has 192 divisors, whose sum is σ = 3235825152. Its totient is φ = 227487744.

The previous prime is 997695653. The next prime is 997695667. The reversal of 997695660 is 66596799.

It is an interprime number because it is at equal distance from previous prime (997695653) and next prime (997695667).

It is a self number, because there is not a number n which added to its sum of digits gives 997695660.

It is not an unprimeable number, because it can be changed into a prime (997695667) 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 63 ways as a sum of consecutive naturals, for example, 887859 + ... + 888981.

It is an arithmetic number, because the mean of its divisors is an integer number (16853256).

Almost surely, 2^997695660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 997695660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1617912576).

997695660 is an abundant number, since it is smaller than the sum of its proper divisors (2238129492).

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

997695660 is a wasteful number, since it uses less digits than its factorization.

997695660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1232 (or 1230 counting only the distinct ones).

The product of its (nonzero) digits is 5511240, while the sum is 57.

The square root of 997695660 is about 31586.3207733981. The cubic root of 997695660 is about 999.2312959121.

The spelling of 997695660 in words is "nine hundred ninety-seven million, six hundred ninety-five thousand, six hundred sixty".