18518520587 has 16 divisors (see below), whose sum is σ = 22363760640. Its totient is φ = 14990687712.

The previous prime is 18518520533. The next prime is 18518520593. The reversal of 18518520587 is 78502581581.

It is not a de Polignac number, because 18518520587 - 2¹⁰ = 18518519563 is a prime.

It is a super-2 number, since 2×18518520587² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18518520887) 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 15 ways as a sum of consecutive naturals, for example, 715268 + ... + 740705.

It is an arithmetic number, because the mean of its divisors is an integer number (1397735040).

Almost surely, 2^18518520587 is an apocalyptic number.

18518520587 is a deficient number, since it is larger than the sum of its proper divisors (3845240053).

18518520587 is a wasteful number, since it uses less digits than its factorization.

18518520587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1456082.

The product of its (nonzero) digits is 896000, while the sum is 50.

The spelling of 18518520587 in words is "eighteen billion, five hundred eighteen million, five hundred twenty thousand, five hundred eighty-seven".