997311663 has 16 divisors (see below), whose sum is σ = 1487289600. Its totient is φ = 660468600.

The previous prime is 997311607. The next prime is 997311677. The reversal of 997311663 is 366113799.

It is not a de Polignac number, because 997311663 - 2¹³ = 997303471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997311163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118233 + ... + 126386.

It is an arithmetic number, because the mean of its divisors is an integer number (92955600).

Almost surely, 2^997311663 is an apocalyptic number.

997311663 is a deficient number, since it is larger than the sum of its proper divisors (489977937).

997311663 is a wasteful number, since it uses less digits than its factorization.

997311663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244779 (or 244773 counting only the distinct ones).

The product of its digits is 183708, while the sum is 45.

The square root of 997311663 is about 31580.2416551869. The cubic root of 997311663 is about 999.1030834479.

The spelling of 997311663 in words is "nine hundred ninety-seven million, three hundred eleven thousand, six hundred sixty-three".