18729678145 has 8 divisors (see below), whose sum is σ = 22811071104. Its totient is φ = 14760104304.

The previous prime is 18729678137. The next prime is 18729678151. The reversal of 18729678145 is 54187692781.

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

It is a cyclic number.

It is not a de Polignac number, because 18729678145 - 2³ = 18729678137 is a prime.

It is an alternating number because its digits alternate between odd and even.

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 18729678145.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27954409 + ... + 27955078.

It is an arithmetic number, because the mean of its divisors is an integer number (2851383888).

Almost surely, 2^18729678145 is an apocalyptic number.

It is an amenable number.

18729678145 is a deficient number, since it is larger than the sum of its proper divisors (4081392959).

18729678145 is an equidigital number, since it uses as much as digits as its factorization.

18729678145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55909559.

The product of its digits is 6773760, while the sum is 58.

The spelling of 18729678145 in words is "eighteen billion, seven hundred twenty-nine million, six hundred seventy-eight thousand, one hundred forty-five".