640103517643 has 4 divisors (see below), whose sum is σ = 640166019688. Its totient is φ = 640041015600.

The previous prime is 640103517619. The next prime is 640103517659. The reversal of 640103517643 is 346715301046.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 640103517643 - 2²⁹ = 639566646731 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 640103517596 and 640103517605.

It is not an unprimeable number, because it can be changed into a prime (640103517043) by changing a digit.

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, 31235658 + ... + 31256143.

It is an arithmetic number, because the mean of its divisors is an integer number (160041504922).

Almost surely, 2^640103517643 is an apocalyptic number.

640103517643 is a deficient number, since it is larger than the sum of its proper divisors (62502045).

640103517643 is a wasteful number, since it uses less digits than its factorization.

640103517643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62502044.

The product of its (nonzero) digits is 181440, while the sum is 40.

Adding to 640103517643 its reverse (346715301046), we get a palindrome (986818818689).

The spelling of 640103517643 in words is "six hundred forty billion, one hundred three million, five hundred seventeen thousand, six hundred forty-three".