645504351046040 has 16 divisors (see below), whose sum is σ = 1452384789853680. Its totient is φ = 258201740418400.

The previous prime is 645504351046039. The next prime is 645504351046063. The reversal of 645504351046040 is 40640153405546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8068804388036 + ... + 8068804388115.

It is an arithmetic number, because the mean of its divisors is an integer number (90774049365855).

Almost surely, 2^{645504351046040} is an apocalyptic number.

It is an amenable number.

645504351046040 is an abundant number, since it is smaller than the sum of its proper divisors (806880438807640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645504351046040 is a wasteful number, since it uses less digits than its factorization.

645504351046040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16137608776162 (or 16137608776158 counting only the distinct ones).

The product of its (nonzero) digits is 3456000, while the sum is 47.

The spelling of 645504351046040 in words is "six hundred forty-five trillion, five hundred four billion, three hundred fifty-one million, forty-six thousand, forty".