645154044143144 has 8 divisors (see below), whose sum is σ = 1209663832768410. Its totient is φ = 322577022071568.

The previous prime is 645154044143083. The next prime is 645154044143159. The reversal of 645154044143144 is 441341440451546.

It can be written as a sum of positive squares in only one way, i.e., 513445598598244 + 131708445544900 = 22659338^2 + 11476430^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 645154044143092 and 645154044143101.

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 as a sum of consecutive naturals, namely, 40322127758939 + ... + 40322127758954.

Almost surely, 2^{645154044143144} is an apocalyptic number.

It is an amenable number.

645154044143144 is a deficient number, since it is larger than the sum of its proper divisors (564509788625266).

645154044143144 is a wasteful number, since it uses less digits than its factorization.

645154044143144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80644255517899 (or 80644255517895 counting only the distinct ones).

The product of its (nonzero) digits is 7372800, while the sum is 50.

The spelling of 645154044143144 in words is "six hundred forty-five trillion, one hundred fifty-four billion, forty-four million, one hundred forty-three thousand, one hundred forty-four".