645545545546 has 16 divisors (see below), whose sum is σ = 1082111825088. Its totient is φ = 286272968800.

The previous prime is 645545545501. The next prime is 645545545597.

645545545546 is nontrivially palindromic in base 10.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 357840310 + ... + 357842113.

It is an arithmetic number, because the mean of its divisors is an integer number (67631989068).

Almost surely, 2^645545545546 is an apocalyptic number.

645545545546 is a deficient number, since it is larger than the sum of its proper divisors (436566279542).

645545545546 is a wasteful number, since it uses less digits than its factorization.

645545545546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715682477.

The product of its digits is 144000000, while the sum is 58.

The spelling of 645545545546 in words is "six hundred forty-five billion, five hundred forty-five million, five hundred forty-five thousand, five hundred forty-six".