646522645 has 16 divisors (see below), whose sum is σ = 816239088. Its totient is φ = 490959360.

The previous prime is 646522637. The next prime is 646522651. The reversal of 646522645 is 546225646.

It can be written as a sum of positive squares in 8 ways, for example, as 651249 + 645871396 = 807^2 + 25414^2 .

It is not a de Polignac number, because 646522645 - 2³ = 646522637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 646522598 and 646522607.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 35034 + ... + 50203.

It is an arithmetic number, because the mean of its divisors is an integer number (51014943).

Almost surely, 2^646522645 is an apocalyptic number.

It is an amenable number.

646522645 is a deficient number, since it is larger than the sum of its proper divisors (169716443).

646522645 is a wasteful number, since it uses less digits than its factorization.

646522645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85320.

The product of its digits is 345600, while the sum is 40.

The square root of 646522645 is about 25426.8095717886. The cubic root of 646522645 is about 864.6916138147.

The spelling of 646522645 in words is "six hundred forty-six million, five hundred twenty-two thousand, six hundred forty-five".