646621003 has 12 divisors (see below), whose sum is σ = 753506712. Its totient is φ = 553277760.

The previous prime is 646620973. The next prime is 646621007. The reversal of 646621003 is 300126646.

646621003 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 646621003 - 2¹⁷ = 646489931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (646621007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17523 + ... + 40003.

It is an arithmetic number, because the mean of its divisors is an integer number (62792226).

Almost surely, 2^646621003 is an apocalyptic number.

646621003 is a deficient number, since it is larger than the sum of its proper divisors (106885709).

646621003 is a wasteful number, since it uses less digits than its factorization.

646621003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23082 (or 23075 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 646621003 is about 25428.7436378599. The cubic root of 646621003 is about 864.7354612220.

Adding to 646621003 its reverse (300126646), we get a palindrome (946747649).

The spelling of 646621003 in words is "six hundred forty-six million, six hundred twenty-one thousand, three".