645264517663422 has 64 divisors (see below), whose sum is σ = 1534973577696000. Its totient is φ = 200314051851744.

The previous prime is 645264517663379. The next prime is 645264517663457. The reversal of 645264517663422 is 224366715462546.

It is a happy number.

645264517663422 is a `hidden beast` number, since 6 + 4 + 5 + 2 + 6 + 4 + 517 + 66 + 34 + 22 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 645264517663422.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5329708833 + ... + 5329829900.

It is an arithmetic number, because the mean of its divisors is an integer number (23983962151500).

Almost surely, 2^{645264517663422} is an apocalyptic number.

645264517663422 is an abundant number, since it is smaller than the sum of its proper divisors (889709060032578).

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

645264517663422 is a wasteful number, since it uses less digits than its factorization.

645264517663422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10659538822 (or 10659538816 counting only the distinct ones).

The product of its digits is 348364800, while the sum is 63.

The spelling of 645264517663422 in words is "six hundred forty-five trillion, two hundred sixty-four billion, five hundred seventeen million, six hundred sixty-three thousand, four hundred twenty-two".