605564256161 has 12 divisors (see below), whose sum is σ = 647378441148. Its totient is φ = 566312577792.

The previous prime is 605564256113. The next prime is 605564256173. The reversal of 605564256161 is 161652465506.

It can be written as a sum of positive squares in 6 ways, for example, as 25749016225 + 579815239936 = 160465^2 + 761456^2 .

It is a de Polignac number, because none of the positive numbers 2^k-605564256161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (605564256181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6627806 + ... + 6718551.

It is an arithmetic number, because the mean of its divisors is an integer number (53948203429).

Almost surely, 2^605564256161 is an apocalyptic number.

It is an amenable number.

605564256161 is a deficient number, since it is larger than the sum of its proper divisors (41814184987).

605564256161 is a wasteful number, since it uses less digits than its factorization.

605564256161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13346548 (or 13346531 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 47.

The spelling of 605564256161 in words is "six hundred five billion, five hundred sixty-four million, two hundred fifty-six thousand, one hundred sixty-one".