645600561111 has 16 divisors (see below), whose sum is σ = 1043394846720. Its totient is φ = 391273067160.

The previous prime is 645600561059. The next prime is 645600561131. The reversal of 645600561111 is 111165006546.

645600561111 is a `hidden beast` number, since 6 + 45 + 600 + 5 + 6 + 1 + 1 + 1 + 1 = 666.

It is not a de Polignac number, because 645600561111 - 2⁹ = 645600560599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645600561131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1086869335 + ... + 1086869928.

It is an arithmetic number, because the mean of its divisors is an integer number (65212177920).

Almost surely, 2^645600561111 is an apocalyptic number.

645600561111 is a deficient number, since it is larger than the sum of its proper divisors (397794285609).

645600561111 is a wasteful number, since it uses less digits than its factorization.

645600561111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2173739283 (or 2173739277 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

Adding to 645600561111 its reverse (111165006546), we get a palindrome (756765567657).

The spelling of 645600561111 in words is "six hundred forty-five billion, six hundred million, five hundred sixty-one thousand, one hundred eleven".