646505043 has 32 divisors (see below), whose sum is σ = 903631872. Its totient is φ = 410810400.

The previous prime is 646504997. The next prime is 646505047. The reversal of 646505043 is 340505646.

It is not a de Polignac number, because 646505043 - 2⁹ = 646504531 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 646504995 and 646505013.

It is not an unprimeable number, because it can be changed into a prime (646505047) 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 31 ways as a sum of consecutive naturals, for example, 1131948 + ... + 1132518.

It is an arithmetic number, because the mean of its divisors is an integer number (28238496).

Almost surely, 2^646505043 is an apocalyptic number.

646505043 is a deficient number, since it is larger than the sum of its proper divisors (257126829).

646505043 is a wasteful number, since it uses less digits than its factorization.

646505043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 815.

The product of its (nonzero) digits is 43200, while the sum is 33.

The square root of 646505043 is about 25426.4634387089. The cubic root of 646505043 is about 864.6837664794.

The spelling of 646505043 in words is "six hundred forty-six million, five hundred five thousand, forty-three".