645286671 has 12 divisors (see below), whose sum is σ = 933351640. Its totient is φ = 429604560.

The previous prime is 645286661. The next prime is 645286693. The reversal of 645286671 is 176682546.

645286671 is a `hidden beast` number, since 64 + 528 + 6 + 67 + 1 = 666.

It is not a de Polignac number, because 645286671 - 2¹³ = 645278479 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 (645286661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41860 + ... + 55161.

Almost surely, 2^645286671 is an apocalyptic number.

645286671 is a deficient number, since it is larger than the sum of its proper divisors (288064969).

645286671 is a wasteful number, since it uses less digits than its factorization.

645286671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97766 (or 97763 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 645286671 is about 25402.4934012392. The cubic root of 645286671 is about 864.1402445632.

The spelling of 645286671 in words is "six hundred forty-five million, two hundred eighty-six thousand, six hundred seventy-one".