18351666685 has 16 divisors (see below), whose sum is σ = 25437177792. Its totient is φ = 12561568000.

The previous prime is 18351666679. The next prime is 18351666689. The reversal of 18351666685 is 58666615381.

It is not a de Polignac number, because 18351666685 - 2⁵ = 18351666653 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18351666689) 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 15 ways as a sum of consecutive naturals, for example, 9812791 + ... + 9814660.

It is an arithmetic number, because the mean of its divisors is an integer number (1589823612).

Almost surely, 2^18351666685 is an apocalyptic number.

It is an amenable number.

18351666685 is a deficient number, since it is larger than the sum of its proper divisors (7085511107).

18351666685 is a wasteful number, since it uses less digits than its factorization.

18351666685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19627484.

The product of its digits is 6220800, while the sum is 55.

The spelling of 18351666685 in words is "eighteen billion, three hundred fifty-one million, six hundred sixty-six thousand, six hundred eighty-five".