18536851685 has 16 divisors (see below), whose sum is σ = 24506692992. Its totient is φ = 13347864000.

The previous prime is 18536851681. The next prime is 18536851703. The reversal of 18536851685 is 58615863581.

It is not a de Polignac number, because 18536851685 - 2² = 18536851681 is a prime.

It is a super-2 number, since 2×18536851685² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18536851685.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18536851681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1662929 + ... + 1674038.

It is an arithmetic number, because the mean of its divisors is an integer number (1531668312).

Almost surely, 2^18536851685 is an apocalyptic number.

It is an amenable number.

18536851685 is a deficient number, since it is larger than the sum of its proper divisors (5969841307).

18536851685 is a wasteful number, since it uses less digits than its factorization.

18536851685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3337084.

The product of its digits is 6912000, while the sum is 56.

The spelling of 18536851685 in words is "eighteen billion, five hundred thirty-six million, eight hundred fifty-one thousand, six hundred eighty-five".