645170044 has 6 divisors (see below), whose sum is σ = 1129047584. Its totient is φ = 322585020.

The previous prime is 645170021. The next prime is 645170051. The reversal of 645170044 is 440071546.

645170044 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 645169988 and 645170015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80646252 + ... + 80646259.

Almost surely, 2^645170044 is an apocalyptic number.

It is an amenable number.

645170044 is a deficient number, since it is larger than the sum of its proper divisors (483877540).

645170044 is a wasteful number, since it uses less digits than its factorization.

645170044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161292515 (or 161292513 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 645170044 is about 25400.1977157659. The cubic root of 645170044 is about 864.0881808004.

The spelling of 645170044 in words is "six hundred forty-five million, one hundred seventy thousand, forty-four".