640300434665 has 4 divisors (see below), whose sum is σ = 768360521604. Its totient is φ = 512240347728.

The previous prime is 640300434637. The next prime is 640300434671. The reversal of 640300434665 is 566434003046.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 245172532201 + 395127902464 = 495149^2 + 628592^2 .

It is a cyclic number.

It is not a de Polignac number, because 640300434665 - 2⁸ = 640300434409 is a prime.

It is a super-3 number, since 3×640300434665³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 64030043462 + ... + 64030043471.

It is an arithmetic number, because the mean of its divisors is an integer number (192090130401).

Almost surely, 2^640300434665 is an apocalyptic number.

It is an amenable number.

640300434665 is a deficient number, since it is larger than the sum of its proper divisors (128060086939).

640300434665 is a wasteful number, since it uses less digits than its factorization.

640300434665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128060086938.

The product of its (nonzero) digits is 622080, while the sum is 41.

The spelling of 640300434665 in words is "six hundred forty billion, three hundred million, four hundred thirty-four thousand, six hundred sixty-five".