645287189289 has 8 divisors (see below), whose sum is σ = 861359520672. Its totient is φ = 429703158720.

The previous prime is 645287189279. The next prime is 645287189297. The reversal of 645287189289 is 982981782546.

645287189289 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 645287189289 - 2⁵ = 645287189257 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (645287189279) 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, 122072119 + ... + 122077404.

It is an arithmetic number, because the mean of its divisors is an integer number (107669940084).

Almost surely, 2^645287189289 is an apocalyptic number.

It is an amenable number.

645287189289 is a deficient number, since it is larger than the sum of its proper divisors (216072331383).

645287189289 is a wasteful number, since it uses less digits than its factorization.

645287189289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244150407.

The product of its digits is 139345920, while the sum is 69.

The spelling of 645287189289 in words is "six hundred forty-five billion, two hundred eighty-seven million, one hundred eighty-nine thousand, two hundred eighty-nine".