646221603 has 8 divisors (see below), whose sum is σ = 861746368. Its totient is φ = 430755624.

The previous prime is 646221571. The next prime is 646221607. The reversal of 646221603 is 306122646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 646221603 - 2⁵ = 646221571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646221607) 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 7 ways as a sum of consecutive naturals, for example, 34176 + ... + 49602.

It is an arithmetic number, because the mean of its divisors is an integer number (107718296).

Almost surely, 2^646221603 is an apocalyptic number.

646221603 is a deficient number, since it is larger than the sum of its proper divisors (215524765).

646221603 is a wasteful number, since it uses less digits than its factorization.

646221603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29393.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 646221603 is about 25420.8891071890. The cubic root of 646221603 is about 864.5573834527.

The spelling of 646221603 in words is "six hundred forty-six million, two hundred twenty-one thousand, six hundred three".