18038775305 has 8 divisors (see below), whose sum is σ = 21647322312. Its totient is φ = 14430492288.

The previous prime is 18038775283. The next prime is 18038775311. The reversal of 18038775305 is 50357783081.

It can be written as a sum of positive squares in 4 ways, for example, as 12759184 + 18026016121 = 3572^2 + 134261^2 .

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 18038775305 - 2¹⁸ = 18038513161 is a prime.

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 18038775305.

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, 146597 + ... + 239933.

It is an arithmetic number, because the mean of its divisors is an integer number (2705915289).

Almost surely, 2^18038775305 is an apocalyptic number.

It is an amenable number.

18038775305 is a deficient number, since it is larger than the sum of its proper divisors (3608547007).

18038775305 is an equidigital number, since it uses as much as digits as its factorization.

18038775305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131995.

The product of its (nonzero) digits is 705600, while the sum is 47.

The spelling of 18038775305 in words is "eighteen billion, thirty-eight million, seven hundred seventy-five thousand, three hundred five".