640140005320623 has 32 divisors (see below), whose sum is σ = 948583947755520. Its totient is φ = 426657238892640.

The previous prime is 640140005320577. The next prime is 640140005320637. The reversal of 640140005320623 is 326023500041046.

640140005320623 is a `hidden beast` number, since 6 + 4 + 0 + 1 + 4 + 0 + 0 + 0 + 5 + 3 + 20 + 623 = 666.

It is not a de Polignac number, because 640140005320623 - 2¹⁰ = 640140005319599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640140004320623) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3158946661 + ... + 3159149297.

It is an arithmetic number, because the mean of its divisors is an integer number (29643248367360).

Almost surely, 2^{640140005320623} is an apocalyptic number.

640140005320623 is a deficient number, since it is larger than the sum of its proper divisors (308443942434897).

640140005320623 is a wasteful number, since it uses less digits than its factorization.

640140005320623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230244 (or 230238 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

Adding to 640140005320623 its reverse (326023500041046), we get a palindrome (966163505361669).

The spelling of 640140005320623 in words is "six hundred forty trillion, one hundred forty billion, five million, three hundred twenty thousand, six hundred twenty-three".