645305145644645 has 32 divisors (see below), whose sum is σ = 799853280132096. Its totient is φ = 499273888204800.

The previous prime is 645305145644483. The next prime is 645305145644657. The reversal of 645305145644645 is 546446541503546.

It is not a de Polignac number, because 645305145644645 - 2⁸ = 645305145644389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7856025275 + ... + 7856107415.

It is an arithmetic number, because the mean of its divisors is an integer number (24995415004128).

Almost surely, 2^{645305145644645} is an apocalyptic number.

It is an amenable number.

645305145644645 is a deficient number, since it is larger than the sum of its proper divisors (154548134487451).

645305145644645 is a wasteful number, since it uses less digits than its factorization.

645305145644645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113741.

The product of its (nonzero) digits is 414720000, while the sum is 62.

The spelling of 645305145644645 in words is "six hundred forty-five trillion, three hundred five billion, one hundred forty-five million, six hundred forty-four thousand, six hundred forty-five".