6640063 has 4 divisors (see below), whose sum is σ = 6989560. Its totient is φ = 6290568.

The previous prime is 6640061. The next prime is 6640069. The reversal of 6640063 is 3600466.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 6640063 - 2¹ = 6640061 is a prime.

It is a magnanimous number.

It is a Duffinian number.

6640063 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640061) 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, 174720 + ... + 174757.

It is an arithmetic number, because the mean of its divisors is an integer number (1747390).

Almost surely, 2^6640063 is an apocalyptic number.

6640063 is a deficient number, since it is larger than the sum of its proper divisors (349497).

6640063 is a wasteful number, since it uses less digits than its factorization.

6640063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349496.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 6640063 is about 2576.8319696868. The cubic root of 6640063 is about 187.9565219361.

The spelling of 6640063 in words is "six million, six hundred forty thousand, sixty-three".