640043358742 has 16 divisors (see below), whose sum is σ = 964225360800. Its totient is φ = 318637798720.

The previous prime is 640043358733. The next prime is 640043358767. The reversal of 640043358742 is 247853340046.

It is a junction number, because it is equal to n+sod(n) for n = 640043358692 and 640043358701.

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 7 ways as a sum of consecutive naturals, for example, 280234 + ... + 1165597.

It is an arithmetic number, because the mean of its divisors is an integer number (60264085050).

Almost surely, 2^640043358742 is an apocalyptic number.

640043358742 is a deficient number, since it is larger than the sum of its proper divisors (324182002058).

640043358742 is a wasteful number, since it uses less digits than its factorization.

640043358742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1446791.

The product of its (nonzero) digits is 1935360, while the sum is 46.

Adding to 640043358742 its reverse (247853340046), we get a palindrome (887896698788).

The spelling of 640043358742 in words is "six hundred forty billion, forty-three million, three hundred fifty-eight thousand, seven hundred forty-two".