640043358745 has 16 divisors (see below), whose sum is σ = 877838855040. Its totient is φ = 438854321664.

The previous prime is 640043358733. The next prime is 640043358767. The reversal of 640043358745 is 547853340046.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640043358745 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 194712 + ... + 1148041.

It is an arithmetic number, because the mean of its divisors is an integer number (54864928440).

Almost surely, 2^640043358745 is an apocalyptic number.

It is an amenable number.

640043358745 is a deficient number, since it is larger than the sum of its proper divisors (237795496295).

640043358745 is a wasteful number, since it uses less digits than its factorization.

640043358745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1356384.

The product of its (nonzero) digits is 4838400, while the sum is 49.

The spelling of 640043358745 in words is "six hundred forty billion, forty-three million, three hundred fifty-eight thousand, seven hundred forty-five".