997663 has 2 divisors, whose sum is σ = 997664. Its totient is φ = 997662.

The previous prime is 997651. The next prime is 997681. The reversal of 997663 is 366799.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 997663 - 2⁹ = 997151 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498831 + 498832.

It is an arithmetic number, because the mean of its divisors is an integer number (498832).

2⁹⁹⁷⁶⁶³ is an apocalyptic number.

997663 is a deficient number, since it is larger than the sum of its proper divisors (1).

997663 is an equidigital number, since it uses as much as digits as its factorization.

997663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61236, while the sum is 40.

The square root of 997663 is about 998.8308165050. The cubic root of 997663 is about 99.9220392370.

The spelling of 997663 in words is "nine hundred ninety-seven thousand, six hundred sixty-three".