18773880385 has 16 divisors (see below), whose sum is σ = 25688786256. Its totient is φ = 13048270848.

The previous prime is 18773880383. The next prime is 18773880397. The reversal of 18773880385 is 58308837781.

It can be written as a sum of positive squares in 8 ways, for example, as 3425643841 + 15348236544 = 58529^2 + 123888^2 .

It is not a de Polignac number, because 18773880385 - 2¹ = 18773880383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18773880383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8493864 + ... + 8496073.

It is an arithmetic number, because the mean of its divisors is an integer number (1605549141).

Almost surely, 2^18773880385 is an apocalyptic number.

It is an amenable number.

18773880385 is a deficient number, since it is larger than the sum of its proper divisors (6914905871).

18773880385 is a wasteful number, since it uses less digits than its factorization.

18773880385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16989972.

The product of its (nonzero) digits is 9031680, while the sum is 58.

The spelling of 18773880385 in words is "eighteen billion, seven hundred seventy-three million, eight hundred eighty thousand, three hundred eighty-five".