646433563 has 8 divisors (see below), whose sum is σ = 653493600. Its totient is φ = 639397248.

The previous prime is 646433507. The next prime is 646433597. The reversal of 646433563 is 365334646.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 646433563 - 2²⁵ = 612879131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646433363) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51898 + ... + 63136.

It is an arithmetic number, because the mean of its divisors is an integer number (81686700).

Almost surely, 2^646433563 is an apocalyptic number.

646433563 is a deficient number, since it is larger than the sum of its proper divisors (7060037).

646433563 is a wasteful number, since it uses less digits than its factorization.

646433563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11861.

The product of its digits is 466560, while the sum is 40.

The square root of 646433563 is about 25425.0577777121. The cubic root of 646433563 is about 864.6518977547.

The spelling of 646433563 in words is "six hundred forty-six million, four hundred thirty-three thousand, five hundred sixty-three".