18518500072277 has 4 divisors (see below), whose sum is σ = 18518509884300. Its totient is φ = 18518490260256.

The previous prime is 18518500072249. The next prime is 18518500072343. The reversal of 18518500072277 is 77227000581581.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1340243820721 + 17178256251556 = 1157689^2 + 4144666^2 .

It is a cyclic number.

It is not a de Polignac number, because 18518500072277 - 2¹⁴ = 18518500055893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18518500072207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1080902 + ... + 6181047.

It is an arithmetic number, because the mean of its divisors is an integer number (4629627471075).

Almost surely, 2^{18518500072277} is an apocalyptic number.

It is an amenable number.

18518500072277 is a deficient number, since it is larger than the sum of its proper divisors (9812023).

18518500072277 is an equidigital number, since it uses as much as digits as its factorization.

18518500072277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9812022.

The product of its (nonzero) digits is 2195200, while the sum is 53.

The spelling of 18518500072277 in words is "eighteen trillion, five hundred eighteen billion, five hundred million, seventy-two thousand, two hundred seventy-seven".