997148771208 has 108 divisors (see below), whose sum is σ = 2723638336965. Its totient is φ = 329572653696.

The previous prime is 997148771197. The next prime is 997148771209. The reversal of 997148771208 is 802177841799.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 989471857284 + 7676913924 = 994722^2 + 87618^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=706098.

It is not an unprimeable number, because it can be changed into a prime (997148771209) 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 26 ways as a sum of consecutive naturals, for example, 1160824683 + ... + 1160825541.

Almost surely, 2^997148771208 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 997148771208

997148771208 is an abundant number, since it is smaller than the sum of its proper divisors (1726489565757).

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

997148771208 is an equidigital number, since it uses as much as digits as its factorization.

997148771208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2004 (or 1001 counting only the distinct ones).

The product of its (nonzero) digits is 14224896, while the sum is 63.

The spelling of 997148771208 in words is "nine hundred ninety-seven billion, one hundred forty-eight million, seven hundred seventy-one thousand, two hundred eight".