645671227328 has 56 divisors (see below), whose sum is σ = 1288685737584. Its totient is φ = 320967680000.

The previous prime is 645671227321. The next prime is 645671227337. The reversal of 645671227328 is 823722176546.

It is a self number, because there is not a number n which added to its sum of digits gives 645671227328.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645671227321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8911568 + ... + 8983728.

It is an arithmetic number, because the mean of its divisors is an integer number (23012245314).

Almost surely, 2^645671227328 is an apocalyptic number.

It is an amenable number.

645671227328 is a deficient number, since it is larger than the sum of its proper divisors (643014510256).

645671227328 is a wasteful number, since it uses less digits than its factorization.

645671227328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72981 (or 72971 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 53.

The spelling of 645671227328 in words is "six hundred forty-five billion, six hundred seventy-one million, two hundred twenty-seven thousand, three hundred twenty-eight".