641644545 has 16 divisors (see below), whose sum is σ = 1027541952. Its totient is φ = 341906880.

The previous prime is 641644477. The next prime is 641644571. The reversal of 641644545 is 545446146.

It is not a de Polignac number, because 641644545 - 2¹⁰ = 641643521 is a prime.

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, 946 + ... + 35835.

It is an arithmetic number, because the mean of its divisors is an integer number (64221372).

Almost surely, 2^641644545 is an apocalyptic number.

It is an amenable number.

641644545 is a deficient number, since it is larger than the sum of its proper divisors (385897407).

641644545 is a wasteful number, since it uses less digits than its factorization.

641644545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37952.

The product of its digits is 230400, while the sum is 39.

The square root of 641644545 is about 25330.7036025453. The cubic root of 641644545 is about 862.5113831726.

The spelling of 641644545 in words is "six hundred forty-one million, six hundred forty-four thousand, five hundred forty-five".