645287189288 has 24 divisors (see below), whose sum is σ = 1407450375450. Its totient is φ = 276551652384.

The previous prime is 645287189279. The next prime is 645287189297. The reversal of 645287189288 is 882981782546.

It is an interprime number because it is at equal distance from previous prime (645287189279) and next prime (645287189297).

It can be written as a sum of positive squares in only one way, i.e., 627609359524 + 17677829764 = 792218^2 + 132958^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 823070003 + ... + 823070786.

Almost surely, 2^645287189288 is an apocalyptic number.

It is an amenable number.

645287189288 is an abundant number, since it is smaller than the sum of its proper divisors (762163186162).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645287189288 is a wasteful number, since it uses less digits than its factorization.

645287189288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1646140809 (or 1646140798 counting only the distinct ones).

The product of its digits is 123863040, while the sum is 68.

The spelling of 645287189288 in words is "six hundred forty-five billion, two hundred eighty-seven million, one hundred eighty-nine thousand, two hundred eighty-eight".