18135756569 has 6 divisors (see below), whose sum is σ = 21096696474. Its totient is φ = 15544934160.

The previous prime is 18135756539. The next prime is 18135756577. The reversal of 18135756569 is 96565753181.

It can be written as a sum of positive squares in only one way, i.e., 15109326400 + 3026430169 = 122920^2 + 55013^2 .

It is a de Polignac number, because none of the positive numbers 2^k-18135756569 is a prime.

It is a super-2 number, since 2×18135756569² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18135756539) 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 5 ways as a sum of consecutive naturals, for example, 185058692 + ... + 185058789.

It is an arithmetic number, because the mean of its divisors is an integer number (3516116079).

Almost surely, 2^18135756569 is an apocalyptic number.

It is an amenable number.

18135756569 is a deficient number, since it is larger than the sum of its proper divisors (2960939905).

18135756569 is an equidigital number, since it uses as much as digits as its factorization.

18135756569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370117495 (or 370117488 counting only the distinct ones).

The product of its digits is 6804000, while the sum is 56.

The spelling of 18135756569 in words is "eighteen billion, one hundred thirty-five million, seven hundred fifty-six thousand, five hundred sixty-nine".