18887775393 has 16 divisors (see below), whose sum is σ = 25312640256. Its totient is φ = 12527460240.

The previous prime is 18887775391. The next prime is 18887775427. The reversal of 18887775393 is 39357778881.

It is a happy number.

It is not a de Polignac number, because 18887775393 - 2¹ = 18887775391 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18887775391) 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, 1028058 + ... + 1046268.

It is an arithmetic number, because the mean of its divisors is an integer number (1582040016).

Almost surely, 2^18887775393 is an apocalyptic number.

It is an amenable number.

18887775393 is a deficient number, since it is larger than the sum of its proper divisors (6424864863).

18887775393 is a wasteful number, since it uses less digits than its factorization.

18887775393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19964.

The product of its digits is 71124480, while the sum is 66.

The spelling of 18887775393 in words is "eighteen billion, eight hundred eighty-seven million, seven hundred seventy-five thousand, three hundred ninety-three".