18836816545 has 8 divisors (see below), whose sum is σ = 22837213224. Its totient is φ = 14914097664.

The previous prime is 18836816539. The next prime is 18836816563. The reversal of 18836816545 is 54561863881.

It can be written as a sum of positive squares in 4 ways, for example, as 229946896 + 18606869649 = 15164^2 + 136407^2 .

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 18836816545 - 2¹¹ = 18836814497 is a prime.

It is a Duffinian 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, 19418914 + ... + 19419883.

It is an arithmetic number, because the mean of its divisors is an integer number (2854651653).

Almost surely, 2^18836816545 is an apocalyptic number.

It is an amenable number.

18836816545 is a deficient number, since it is larger than the sum of its proper divisors (4000396679).

18836816545 is an equidigital number, since it uses as much as digits as its factorization.

18836816545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38838899.

The product of its digits is 5529600, while the sum is 55.

The spelling of 18836816545 in words is "eighteen billion, eight hundred thirty-six million, eight hundred sixteen thousand, five hundred forty-five".