18421360745 has 8 divisors (see below), whose sum is σ = 22220171016. Its totient is φ = 14660729856.

The previous prime is 18421360723. The next prime is 18421360751. The reversal of 18421360745 is 54706312481.

It can be written as a sum of positive squares in 4 ways, for example, as 3613801 + 18417746944 = 1901^2 + 135712^2 .

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 18421360745 - 2³⁰ = 17347618921 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 9543782 + ... + 9545711.

It is an arithmetic number, because the mean of its divisors is an integer number (2777521377).

Almost surely, 2^18421360745 is an apocalyptic number.

It is an amenable number.

18421360745 is a deficient number, since it is larger than the sum of its proper divisors (3798810271).

18421360745 is a wasteful number, since it uses less digits than its factorization.

18421360745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19089691.

The product of its (nonzero) digits is 161280, while the sum is 41.

The spelling of 18421360745 in words is "eighteen billion, four hundred twenty-one million, three hundred sixty thousand, seven hundred forty-five".