18518501685 has 16 divisors (see below), whose sum is σ = 29719126080. Its totient is φ = 9846693120.

The previous prime is 18518501669. The next prime is 18518501707. The reversal of 18518501685 is 58610581581.

It is not a de Polignac number, because 18518501685 - 2⁴ = 18518501669 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 1859940 + ... + 1869869.

It is an arithmetic number, because the mean of its divisors is an integer number (1857445380).

Almost surely, 2^18518501685 is an apocalyptic number.

18518501685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18518501685 is a deficient number, since it is larger than the sum of its proper divisors (11200624395).

18518501685 is a wasteful number, since it uses less digits than its factorization.

18518501685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3730148.

The product of its (nonzero) digits is 384000, while the sum is 48.

The spelling of 18518501685 in words is "eighteen billion, five hundred eighteen million, five hundred one thousand, six hundred eighty-five".