645063554223 has 20 divisors (see below), whose sum is σ = 1051214682408. Its totient is φ = 390947608080.

The previous prime is 645063554203. The next prime is 645063554227. The reversal of 645063554223 is 322455360546.

645063554223 is a `hidden beast` number, since 6 + 4 + 5 + 0 + 635 + 5 + 4 + 2 + 2 + 3 = 666.

It is not a de Polignac number, because 645063554223 - 2²⁴ = 645046777007 is a prime.

It is a super-2 number, since 2×645063554223² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645063554227) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 361987636 + ... + 361989417.

Almost surely, 2^645063554223 is an apocalyptic number.

645063554223 is a deficient number, since it is larger than the sum of its proper divisors (406151128185).

645063554223 is a wasteful number, since it uses less digits than its factorization.

645063554223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723977076 (or 723977067 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 45.

The spelling of 645063554223 in words is "six hundred forty-five billion, sixty-three million, five hundred fifty-four thousand, two hundred twenty-three".