646663023 has 12 divisors (see below), whose sum is σ = 959314408. Its totient is φ = 419456880.

The previous prime is 646663021. The next prime is 646663027. The reversal of 646663023 is 320366646.

It is not a de Polignac number, because 646663023 - 2¹ = 646663021 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 (646663021) 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 11 ways as a sum of consecutive naturals, for example, 970633 + ... + 971298.

Almost surely, 2^646663023 is an apocalyptic number.

646663023 is a deficient number, since it is larger than the sum of its proper divisors (312651385).

646663023 is a wasteful number, since it uses less digits than its factorization.

646663023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1941974 (or 1941971 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 36.

The square root of 646663023 is about 25429.5698547970. The cubic root of 646663023 is about 864.7541921307.

The spelling of 646663023 in words is "six hundred forty-six million, six hundred sixty-three thousand, twenty-three".