640124426342 has 16 divisors (see below), whose sum is σ = 963599036400. Its totient is φ = 318926362080.

The previous prime is 640124426341. The next prime is 640124426351. The reversal of 640124426342 is 243624421046.

It is a junction number, because it is equal to n+sod(n) for n = 640124426296 and 640124426305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640124426341) 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 7 ways as a sum of consecutive naturals, for example, 391409 + ... + 1197267.

It is an arithmetic number, because the mean of its divisors is an integer number (60224939775).

Almost surely, 2^640124426342 is an apocalyptic number.

640124426342 is a deficient number, since it is larger than the sum of its proper divisors (323474610058).

640124426342 is a wasteful number, since it uses less digits than its factorization.

640124426342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807271.

The product of its (nonzero) digits is 221184, while the sum is 38.

Adding to 640124426342 its reverse (243624421046), we get a palindrome (883748847388).

The spelling of 640124426342 in words is "six hundred forty billion, one hundred twenty-four million, four hundred twenty-six thousand, three hundred forty-two".