256640453573271 has 8 divisors (see below), whose sum is σ = 342187487578224. Its totient is φ = 171093527641920.

The previous prime is 256640453573171. The next prime is 256640453573279. The reversal of 256640453573271 is 172375354046652.

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

It is not a de Polignac number, because 256640453573271 - 2⁹ = 256640453572759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256640453573279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21304870 + ... + 31099491.

It is an arithmetic number, because the mean of its divisors is an integer number (42773435947278).

Almost surely, 2^{256640453573271} is an apocalyptic number.

256640453573271 is a deficient number, since it is larger than the sum of its proper divisors (85547034004953).

256640453573271 is a wasteful number, since it uses less digits than its factorization.

256640453573271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54036801.

The product of its (nonzero) digits is 127008000, while the sum is 60.

The spelling of 256640453573271 in words is "two hundred fifty-six trillion, six hundred forty billion, four hundred fifty-three million, five hundred seventy-three thousand, two hundred seventy-one".