19918418033 has 8 divisors (see below), whose sum is σ = 21124505448. Its totient is φ = 18716154624.

The previous prime is 19918418027. The next prime is 19918418053. The reversal of 19918418033 is 33081481991.

It can be written as a sum of positive squares in 4 ways, for example, as 3792465889 + 16125952144 = 61583^2 + 126988^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19918418033 - 2⁴ = 19918418017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19918418053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 945266 + ... + 966107.

It is an arithmetic number, because the mean of its divisors is an integer number (2640563181).

Almost surely, 2^19918418033 is an apocalyptic number.

It is an amenable number.

19918418033 is a deficient number, since it is larger than the sum of its proper divisors (1206087415).

19918418033 is a wasteful number, since it uses less digits than its factorization.

19918418033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1912003.

The product of its (nonzero) digits is 186624, while the sum is 47.

The spelling of 19918418033 in words is "nineteen billion, nine hundred eighteen million, four hundred eighteen thousand, thirty-three".