6663963 has 4 divisors (see below), whose sum is σ = 8885288. Its totient is φ = 4442640.

The previous prime is 6663961. The next prime is 6663971. The reversal of 6663963 is 3693666.

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

It is not a de Polignac number, because 6663963 - 2¹ = 6663961 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6663961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1110658 + ... + 1110663.

It is an arithmetic number, because the mean of its divisors is an integer number (2221322).

Almost surely, 2^6663963 is an apocalyptic number.

6663963 is a deficient number, since it is larger than the sum of its proper divisors (2221325).

6663963 is a wasteful number, since it uses less digits than its factorization.

6663963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2221324.

The product of its digits is 104976, while the sum is 39.

The square root of 6663963 is about 2581.4652815794. The cubic root of 6663963 is about 188.1817598586.

It can be divided in two parts, 6663 and 963, that added together give a triangular number (7626 = T₁₂₃).

The spelling of 6663963 in words is "six million, six hundred sixty-three thousand, nine hundred sixty-three".