645053620305 has 16 divisors (see below), whose sum is σ = 1033541501760. Its totient is φ = 343543361088.

The previous prime is 645053620303. The next prime is 645053620327. The reversal of 645053620305 is 503026350546.

It is not a de Polignac number, because 645053620305 - 2¹ = 645053620303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645053620303) 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 15 ways as a sum of consecutive naturals, for example, 30316287 + ... + 30337556.

It is an arithmetic number, because the mean of its divisors is an integer number (64596343860).

Almost surely, 2^645053620305 is an apocalyptic number.

It is an amenable number.

645053620305 is a deficient number, since it is larger than the sum of its proper divisors (388487881455).

645053620305 is a wasteful number, since it uses less digits than its factorization.

645053620305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60654560.

The product of its (nonzero) digits is 324000, while the sum is 39.

The spelling of 645053620305 in words is "six hundred forty-five billion, fifty-three million, six hundred twenty thousand, three hundred five".