6997663 has 2 divisors, whose sum is σ = 6997664. Its totient is φ = 6997662.

The previous prime is 6997657. The next prime is 6997687. The reversal of 6997663 is 3667996.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6997663 - 2⁵ = 6997631 is a prime.

6997663 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6997603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3498831 + 3498832.

It is an arithmetic number, because the mean of its divisors is an integer number (3498832).

Almost surely, 2^6997663 is an apocalyptic number.

6997663 is a deficient number, since it is larger than the sum of its proper divisors (1).

6997663 is an equidigital number, since it uses as much as digits as its factorization.

6997663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 367416, while the sum is 46.

The square root of 6997663 is about 2645.3096227096. The cubic root of 6997663 is about 191.2718277164.

The spelling of 6997663 in words is "six million, nine hundred ninety-seven thousand, six hundred sixty-three".