6990663 has 4 divisors (see below), whose sum is σ = 9320888. Its totient is φ = 4660440.

The previous prime is 6990629. The next prime is 6990667. The reversal of 6990663 is 3660996.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-6990663 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6990667) 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 in 3 ways as a sum of consecutive naturals, for example, 1165108 + ... + 1165113.

It is an arithmetic number, because the mean of its divisors is an integer number (2330222).

Almost surely, 2^6990663 is an apocalyptic number.

6990663 is a deficient number, since it is larger than the sum of its proper divisors (2330225).

6990663 is a wasteful number, since it uses less digits than its factorization.

6990663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2330224.

The product of its (nonzero) digits is 52488, while the sum is 39.

The square root of 6990663 is about 2643.9861951228. The cubic root of 6990663 is about 191.2080278691.

The spelling of 6990663 in words is "six million, nine hundred ninety thousand, six hundred sixty-three".