640514450020023 has 64 divisors (see below), whose sum is σ = 960332966714880. Its totient is φ = 421902043490304.

The previous prime is 640514450020019. The next prime is 640514450020063. The reversal of 640514450020023 is 320020054415046.

640514450020023 is a `hidden beast` number, since 6 + 4 + 0 + 5 + 1 + 445 + 0 + 0 + 200 + 2 + 3 = 666.

It is not a de Polignac number, because 640514450020023 - 2² = 640514450020019 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 640514450020023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640514450020063) 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 in 63 ways as a sum of consecutive naturals, for example, 1834884340 + ... + 1835233382.

It is an arithmetic number, because the mean of its divisors is an integer number (15005202604920).

Almost surely, 2^{640514450020023} is an apocalyptic number.

640514450020023 is a deficient number, since it is larger than the sum of its proper divisors (319818516694857).

640514450020023 is a wasteful number, since it uses less digits than its factorization.

640514450020023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351645 (or 351639 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

The spelling of 640514450020023 in words is "six hundred forty trillion, five hundred fourteen billion, four hundred fifty million, twenty thousand, twenty-three".