5518778155 has 16 divisors (see below), whose sum is σ = 7473708000. Its totient is φ = 3875253760.

The previous prime is 5518778143. The next prime is 5518778191.

5518778155 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 5518778155 - 2⁵ = 5518778123 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1728430 + ... + 1731619.

It is an arithmetic number, because the mean of its divisors is an integer number (467106750).

Almost surely, 2^5518778155 is an apocalyptic number.

5518778155 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

5518778155 is a deficient number, since it is larger than the sum of its proper divisors (1954929845).

5518778155 is a wasteful number, since it uses less digits than its factorization.

5518778155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3460094.

The product of its digits is 1960000, while the sum is 52.

The square root of 5518778155 is about 74288.4792885142. The cubic root of 5518778155 is about 1767.1807774953.

The spelling of 5518778155 in words is "five billion, five hundred eighteen million, seven hundred seventy-eight thousand, one hundred fifty-five".