6640256603 has 4 divisors (see below), whose sum is σ = 6640440600. Its totient is φ = 6640072608.

The previous prime is 6640256573. The next prime is 6640256621. The reversal of 6640256603 is 3066520466.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6640256603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6640256663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18053 + ... + 116646.

It is an arithmetic number, because the mean of its divisors is an integer number (1660110150).

Almost surely, 2^6640256603 is an apocalyptic number.

6640256603 is a deficient number, since it is larger than the sum of its proper divisors (183997).

6640256603 is a wasteful number, since it uses less digits than its factorization.

6640256603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183996.

The product of its (nonzero) digits is 155520, while the sum is 38.

The square root of 6640256603 is about 81487.7696528749. The cubic root of 6640256603 is about 1879.5834865536.

The spelling of 6640256603 in words is "six billion, six hundred forty million, two hundred fifty-six thousand, six hundred three".