646663301 has 4 divisors (see below), whose sum is σ = 648527232. Its totient is φ = 644799372.

The previous prime is 646663249. The next prime is 646663327. The reversal of 646663301 is 103366646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 646663301 - 2¹⁸ = 646401157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646666301) 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 3 ways as a sum of consecutive naturals, for example, 931445 + ... + 932138.

It is an arithmetic number, because the mean of its divisors is an integer number (162131808).

Almost surely, 2^646663301 is an apocalyptic number.

It is an amenable number.

646663301 is a deficient number, since it is larger than the sum of its proper divisors (1863931).

646663301 is a wasteful number, since it uses less digits than its factorization.

646663301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1863930.

The product of its (nonzero) digits is 46656, while the sum is 35.

The square root of 646663301 is about 25429.5753208739. The cubic root of 646663301 is about 864.7543160498.

The spelling of 646663301 in words is "six hundred forty-six million, six hundred sixty-three thousand, three hundred one".