640043358743 has 8 divisors (see below), whose sum is σ = 641535565440. Its totient is φ = 638551308600.

The previous prime is 640043358733. The next prime is 640043358767. The reversal of 640043358743 is 347853340046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 640043358743 - 2⁶ = 640043358679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640043358733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13755668 + ... + 13802118.

It is an arithmetic number, because the mean of its divisors is an integer number (80191945680).

Almost surely, 2^640043358743 is an apocalyptic number.

640043358743 is a deficient number, since it is larger than the sum of its proper divisors (1492206697).

640043358743 is a wasteful number, since it uses less digits than its factorization.

640043358743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78277.

The product of its (nonzero) digits is 2903040, while the sum is 47.

Adding to 640043358743 its reverse (347853340046), we get a palindrome (987896698789).

The spelling of 640043358743 in words is "six hundred forty billion, forty-three million, three hundred fifty-eight thousand, seven hundred forty-three".