18078919685 has 8 divisors (see below), whose sum is σ = 21725656056. Its totient is φ = 14442500800.

The previous prime is 18078919679. The next prime is 18078919711. The reversal of 18078919685 is 58691987081.

It can be written as a sum of positive squares in 4 ways, for example, as 8149395076 + 9929524609 = 90274^2 + 99647^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18078919685 - 2⁴ = 18078919669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2575514 + ... + 2582523.

It is an arithmetic number, because the mean of its divisors is an integer number (2715707007).

Almost surely, 2^18078919685 is an apocalyptic number.

It is an amenable number.

18078919685 is a deficient number, since it is larger than the sum of its proper divisors (3646736371).

18078919685 is an equidigital number, since it uses as much as digits as its factorization.

18078919685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5158743.

The product of its (nonzero) digits is 8709120, while the sum is 62.

The spelling of 18078919685 in words is "eighteen billion, seventy-eight million, nine hundred nineteen thousand, six hundred eighty-five".