645064354556 has 12 divisors (see below), whose sum is σ = 1134592888968. Its totient is φ = 320894957712.

The previous prime is 645064354523. The next prime is 645064354579. The reversal of 645064354556 is 655453460546.

It is a super-2 number, since 2×645064354556² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645064354498 and 645064354507.

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, 409304006 + ... + 409305581.

It is an arithmetic number, because the mean of its divisors is an integer number (94549407414).

Almost surely, 2^645064354556 is an apocalyptic number.

It is an amenable number.

645064354556 is a deficient number, since it is larger than the sum of its proper divisors (489528534412).

645064354556 is a wasteful number, since it uses less digits than its factorization.

645064354556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818609788 (or 818609786 counting only the distinct ones).

The product of its (nonzero) digits is 25920000, while the sum is 53.

The spelling of 645064354556 in words is "six hundred forty-five billion, sixty-four million, three hundred fifty-four thousand, five hundred fifty-six".