4155811817979 has 16 divisors (see below), whose sum is σ = 5550059370240. Its totient is φ = 2766053603040.

The previous prime is 4155811817933. The next prime is 4155811818013. The reversal of 4155811817979 is 9797181185514.

It is not a de Polignac number, because 4155811817979 - 2⁷ = 4155811817851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4155811819979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20155749 + ... + 20360889.

It is an arithmetic number, because the mean of its divisors is an integer number (346878710640).

Almost surely, 2^{4155811817979} is an apocalyptic number.

4155811817979 is a deficient number, since it is larger than the sum of its proper divisors (1394247552261).

4155811817979 is a wasteful number, since it uses less digits than its factorization.

4155811817979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216050.

The product of its digits is 25401600, while the sum is 66.

The spelling of 4155811817979 in words is "four trillion, one hundred fifty-five billion, eight hundred eleven million, eight hundred seventeen thousand, nine hundred seventy-nine".