645065055646 has 32 divisors (see below), whose sum is σ = 1103090047488. Its totient is φ = 280299042240.

The previous prime is 645065055631. The next prime is 645065055667. The reversal of 645065055646 is 646550560546.

It is a super-2 number, since 2×645065055646² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645065055593 and 645065055602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7209655 + ... + 7298578.

It is an arithmetic number, because the mean of its divisors is an integer number (34471563984).

Almost surely, 2^645065055646 is an apocalyptic number.

645065055646 is a deficient number, since it is larger than the sum of its proper divisors (458024991842).

645065055646 is a wasteful number, since it uses less digits than its factorization.

645065055646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14508336.

The product of its (nonzero) digits is 12960000, while the sum is 52.

The spelling of 645065055646 in words is "six hundred forty-five billion, sixty-five million, fifty-five thousand, six hundred forty-six".