645482081271 has 8 divisors (see below), whose sum is σ = 867419490304. Its totient is φ = 426933029880.

The previous prime is 645482081227. The next prime is 645482081297. The reversal of 645482081271 is 172180284546.

It is a happy number.

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

It is not a de Polignac number, because 645482081271 - 2⁶ = 645482081207 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 645482081271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645482083271) 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, 847088965 + ... + 847089726.

It is an arithmetic number, because the mean of its divisors is an integer number (108427436288).

Almost surely, 2^645482081271 is an apocalyptic number.

645482081271 is a deficient number, since it is larger than the sum of its proper divisors (221937409033).

645482081271 is a wasteful number, since it uses less digits than its factorization.

645482081271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1694178821.

The product of its (nonzero) digits is 860160, while the sum is 48.

The spelling of 645482081271 in words is "six hundred forty-five billion, four hundred eighty-two million, eighty-one thousand, two hundred seventy-one".