645887163 has 8 divisors (see below), whose sum is σ = 861347088. Its totient is φ = 430509344.

The previous prime is 645887153. The next prime is 645887189. The reversal of 645887163 is 361788546.

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 645887163 - 2⁵ = 645887131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645887153) 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, 1081 + ... + 35957.

It is an arithmetic number, because the mean of its divisors is an integer number (107668386).

Almost surely, 2^645887163 is an apocalyptic number.

645887163 is a deficient number, since it is larger than the sum of its proper divisors (215459925).

645887163 is a wasteful number, since it uses less digits than its factorization.

645887163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41053.

The product of its digits is 967680, while the sum is 48.

The square root of 645887163 is about 25414.3102011446. The cubic root of 645887163 is about 864.4082125056.

The spelling of 645887163 in words is "six hundred forty-five million, eight hundred eighty-seven thousand, one hundred sixty-three".