18927019433 has 4 divisors (see below), whose sum is σ = 21630879360. Its totient is φ = 16223159508.

The previous prime is 18927019417. The next prime is 18927019439. The reversal of 18927019433 is 33491072981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 33491072981 = 773 ⋅43326097.

It is a cyclic number.

It is not a de Polignac number, because 18927019433 - 2⁴ = 18927019417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18927019439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1351929953 + ... + 1351929966.

It is an arithmetic number, because the mean of its divisors is an integer number (5407719840).

Almost surely, 2^18927019433 is an apocalyptic number.

It is an amenable number.

18927019433 is a deficient number, since it is larger than the sum of its proper divisors (2703859927).

18927019433 is an equidigital number, since it uses as much as digits as its factorization.

18927019433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2703859926.

The product of its (nonzero) digits is 326592, while the sum is 47.

The spelling of 18927019433 in words is "eighteen billion, nine hundred twenty-seven million, nineteen thousand, four hundred thirty-three".