645534168104 has 48 divisors (see below), whose sum is σ = 1408676642100. Its totient is φ = 276522398208.

The previous prime is 645534168101. The next prime is 645534168113. The reversal of 645534168104 is 401861435546.

It can be written as a sum of positive squares in 2 ways, for example, as 625836045604 + 19698122500 = 791098^2 + 140350^2 .

It is not an unprimeable number, because it can be changed into a prime (645534168101) 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, 403712 + ... + 1205840.

Almost surely, 2^645534168104 is an apocalyptic number.

It is an amenable number.

645534168104 is an abundant number, since it is smaller than the sum of its proper divisors (763142473996).

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

645534168104 is a wasteful number, since it uses less digits than its factorization.

645534168104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804202 (or 804191 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 47.

The spelling of 645534168104 in words is "six hundred forty-five billion, five hundred thirty-four million, one hundred sixty-eight thousand, one hundred four".