4155981865 has 16 divisors (see below), whose sum is σ = 5700895488. Its totient is φ = 2849184576.

The previous prime is 4155981859. The next prime is 4155981877. The reversal of 4155981865 is 5681895514.

It is a happy number.

4155981865 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 4155981865 - 2⁵ = 4155981833 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 192139 + ... + 212671.

It is an arithmetic number, because the mean of its divisors is an integer number (356305968).

Almost surely, 2^4155981865 is an apocalyptic number.

It is an amenable number.

4155981865 is a deficient number, since it is larger than the sum of its proper divisors (1544913623).

4155981865 is a wasteful number, since it uses less digits than its factorization.

4155981865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26328.

The product of its digits is 1728000, while the sum is 52.

The square root of 4155981865 is about 64466.9051917338. The cubic root of 4155981865 is about 1607.7723219192.

The spelling of 4155981865 in words is "four billion, one hundred fifty-five million, nine hundred eighty-one thousand, eight hundred sixty-five".