645224773057 has 16 divisors (see below), whose sum is σ = 653724720000. Its totient is φ = 636782065920.

The previous prime is 645224773009. The next prime is 645224773091. The reversal of 645224773057 is 750377422546.

It is a cyclic number.

It is not a de Polignac number, because 645224773057 - 2³¹ = 643077289409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645224772995 and 645224773013.

It is not an unprimeable number, because it can be changed into a prime (645224773007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72910569 + ... + 72919417.

It is an arithmetic number, because the mean of its divisors is an integer number (40857795000).

Almost surely, 2^645224773057 is an apocalyptic number.

It is an amenable number.

645224773057 is a deficient number, since it is larger than the sum of its proper divisors (8499946943).

645224773057 is a wasteful number, since it uses less digits than its factorization.

645224773057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11976.

The product of its (nonzero) digits is 9878400, while the sum is 52.

The spelling of 645224773057 in words is "six hundred forty-five billion, two hundred twenty-four million, seven hundred seventy-three thousand, fifty-seven".