4181561168 has 10 divisors (see below), whose sum is σ = 8101774794. Its totient is φ = 2090780576.

The previous prime is 4181561149. The next prime is 4181561191. The reversal of 4181561168 is 8611651814.

It can be written as a sum of positive squares in only one way, i.e., 3432553744 + 749007424 = 58588^2 + 27368^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130673771 + ... + 130673802.

Almost surely, 2^4181561168 is an apocalyptic number.

It is an amenable number.

4181561168 is a deficient number, since it is larger than the sum of its proper divisors (3920213626).

4181561168 is a wasteful number, since it uses less digits than its factorization.

4181561168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261347581 (or 261347575 counting only the distinct ones).

The product of its digits is 46080, while the sum is 41.

The square root of 4181561168 is about 64664.9918271084. The cubic root of 4181561168 is about 1611.0640918981.

The spelling of 4181561168 in words is "four billion, one hundred eighty-one million, five hundred sixty-one thousand, one hundred sixty-eight".