640140004320623 has 2 divisors, whose sum is σ = 640140004320624. Its totient is φ = 640140004320622.

The previous prime is 640140004320613. The next prime is 640140004320643. The reversal of 640140004320623 is 326023400041046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 640140004320623 - 2²⁶ = 640139937211759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640140004320613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320070002160311 + 320070002160312.

It is an arithmetic number, because the mean of its divisors is an integer number (320070002160312).

Almost surely, 2^{640140004320623} is an apocalyptic number.

640140004320623 is a deficient number, since it is larger than the sum of its proper divisors (1).

640140004320623 is an equidigital number, since it uses as much as digits as its factorization.

640140004320623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 35.

Adding to 640140004320623 its reverse (326023400041046), we get a palindrome (966163404361669).

The spelling of 640140004320623 in words is "six hundred forty trillion, one hundred forty billion, four million, three hundred twenty thousand, six hundred twenty-three".