18512774253 has 6 divisors (see below), whose sum is σ = 26740673934. Its totient is φ = 12341849496.

The previous prime is 18512774207. The next prime is 18512774281. The reversal of 18512774253 is 35247721581.

18512774253 is a `hidden beast` number, since 18 + 512 + 7 + 74 + 2 + 53 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12033651204 + 6479123049 = 109698^2 + 80493^2 .

It is not a de Polignac number, because 18512774253 - 2¹⁰ = 18512773229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18512774199 and 18512774208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18512779253) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 1028487450 + ... + 1028487467.

It is an arithmetic number, because the mean of its divisors is an integer number (4456778989).

Almost surely, 2^18512774253 is an apocalyptic number.

It is an amenable number.

18512774253 is a deficient number, since it is larger than the sum of its proper divisors (8227899681).

18512774253 is a wasteful number, since it uses less digits than its factorization.

18512774253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2056974923 (or 2056974920 counting only the distinct ones).

The product of its digits is 470400, while the sum is 45.

The spelling of 18512774253 in words is "eighteen billion, five hundred twelve million, seven hundred seventy-four thousand, two hundred fifty-three".