18223500155 has 16 divisors (see below), whose sum is σ = 24995974080. Its totient is φ = 12494241792.

The previous prime is 18223500121. The next prime is 18223500157. The reversal of 18223500155 is 55100532281.

It is a cyclic number.

It is not a de Polignac number, because 18223500155 - 2⁶ = 18223500091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18223500157) 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 15 ways as a sum of consecutive naturals, for example, 222587 + ... + 293243.

It is an arithmetic number, because the mean of its divisors is an integer number (1562248380).

Almost surely, 2^18223500155 is an apocalyptic number.

18223500155 is a deficient number, since it is larger than the sum of its proper divisors (6772473925).

18223500155 is an equidigital number, since it uses as much as digits as its factorization.

18223500155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78038.

The product of its (nonzero) digits is 12000, while the sum is 32.

The spelling of 18223500155 in words is "eighteen billion, two hundred twenty-three million, five hundred thousand, one hundred fifty-five".