640245273056 has 24 divisors (see below), whose sum is σ = 1262355855264. Its totient is φ = 319646960640.

The previous prime is 640245273043. The next prime is 640245273077. The reversal of 640245273056 is 650372542046.

It is a junction number, because it is equal to n+sod(n) for n = 640245272998 and 640245273016.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14843000 + ... + 14886071.

It is an arithmetic number, because the mean of its divisors is an integer number (52598160636).

Almost surely, 2^640245273056 is an apocalyptic number.

It is an amenable number.

640245273056 is a deficient number, since it is larger than the sum of its proper divisors (622110582208).

640245273056 is a wasteful number, since it uses less digits than its factorization.

640245273056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29729754 (or 29729746 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 44.

The spelling of 640245273056 in words is "six hundred forty billion, two hundred forty-five million, two hundred seventy-three thousand, fifty-six".