18815018155 has 4 divisors (see below), whose sum is σ = 22578021792. Its totient is φ = 15052014520.

The previous prime is 18815018099. The next prime is 18815018171. The reversal of 18815018155 is 55181051881.

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

It is not a de Polignac number, because 18815018155 - 2¹⁷ = 18814887083 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 3 ways as a sum of consecutive naturals, for example, 1881501811 + ... + 1881501820.

It is an arithmetic number, because the mean of its divisors is an integer number (5644505448).

Almost surely, 2^18815018155 is an apocalyptic number.

18815018155 is a deficient number, since it is larger than the sum of its proper divisors (3763003637).

18815018155 is an equidigital number, since it uses as much as digits as its factorization.

18815018155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3763003636.

The product of its (nonzero) digits is 64000, while the sum is 43.

The spelling of 18815018155 in words is "eighteen billion, eight hundred fifteen million, eighteen thousand, one hundred fifty-five".