640701117741871 has 8 divisors (see below), whose sum is σ = 678208079728080. Its totient is φ = 604221743755392.

The previous prime is 640701117741809. The next prime is 640701117741911. The reversal of 640701117741871 is 178147711107046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 640701117741871 - 2⁹ = 640701117741359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640701117741571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256896998650 + ... + 256897001143.

It is an arithmetic number, because the mean of its divisors is an integer number (84776009966010).

Almost surely, 2^{640701117741871} is an apocalyptic number.

640701117741871 is a deficient number, since it is larger than the sum of its proper divisors (37506961986209).

640701117741871 is a wasteful number, since it uses less digits than its factorization.

640701117741871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513793999865.

The product of its (nonzero) digits is 1843968, while the sum is 55.

The spelling of 640701117741871 in words is "six hundred forty trillion, seven hundred one billion, one hundred seventeen million, seven hundred forty-one thousand, eight hundred seventy-one".