645500463505 has 16 divisors (see below), whose sum is σ = 797310443520. Its totient is φ = 501433474752.

The previous prime is 645500463493. The next prime is 645500463521. The reversal of 645500463505 is 505364005546.

It is a cyclic number.

It is not a de Polignac number, because 645500463505 - 2³⁹ = 95744649617 is a prime.

It is an unprimeable number.

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, 10784370 + ... + 10844059.

It is an arithmetic number, because the mean of its divisors is an integer number (49831902720).

Almost surely, 2^645500463505 is an apocalyptic number.

It is an amenable number.

645500463505 is a deficient number, since it is larger than the sum of its proper divisors (151809980015).

645500463505 is a wasteful number, since it uses less digits than its factorization.

645500463505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21628608.

The product of its (nonzero) digits is 1080000, while the sum is 43.

The spelling of 645500463505 in words is "six hundred forty-five billion, five hundred million, four hundred sixty-three thousand, five hundred five".