640323432423 has 24 divisors (see below), whose sum is σ = 935839537776. Its totient is φ = 421865683200.

The previous prime is 640323432421. The next prime is 640323432433. The reversal of 640323432423 is 324234323046.

640323432423 is a `hidden beast` number, since 6 + 4 + 0 + 323 + 4 + 324 + 2 + 3 = 666.

It is not a de Polignac number, because 640323432423 - 2¹ = 640323432421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640323432421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 842640 + ... + 1410917.

It is an arithmetic number, because the mean of its divisors is an integer number (38993314074).

Almost surely, 2^640323432423 is an apocalyptic number.

640323432423 is a deficient number, since it is larger than the sum of its proper divisors (295516105353).

640323432423 is a wasteful number, since it uses less digits than its factorization.

640323432423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2253935 (or 2253932 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 36.

Adding to 640323432423 its reverse (324234323046), we get a palindrome (964557755469).

The spelling of 640323432423 in words is "six hundred forty billion, three hundred twenty-three million, four hundred thirty-two thousand, four hundred twenty-three".