4155568561 has 4 divisors (see below), whose sum is σ = 4198409572. Its totient is φ = 4112727552.

The previous prime is 4155568541. The next prime is 4155568577. The reversal of 4155568561 is 1658655514.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3262694400 + 892874161 = 57120^2 + 29881^2 .

It is a cyclic number.

It is not a de Polignac number, because 4155568561 - 2⁹ = 4155568049 is a prime.

It is a super-2 number, since 2×4155568561² = 34537500130343221442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4155568541) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 21420360 + ... + 21420553.

It is an arithmetic number, because the mean of its divisors is an integer number (1049602393).

Almost surely, 2^4155568561 is an apocalyptic number.

It is an amenable number.

4155568561 is a deficient number, since it is larger than the sum of its proper divisors (42841011).

4155568561 is an equidigital number, since it uses as much as digits as its factorization.

4155568561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42841010.

The product of its digits is 720000, while the sum is 46.

The square root of 4155568561 is about 64463.6995602952. The cubic root of 4155568561 is about 1607.7190235826.

The spelling of 4155568561 in words is "four billion, one hundred fifty-five million, five hundred sixty-eight thousand, five hundred sixty-one".