18005951919 has 16 divisors (see below), whose sum is σ = 24700929120. Its totient is φ = 11660029440.

The previous prime is 18005951911. The next prime is 18005951921. The reversal of 18005951919 is 91915950081.

It is not a de Polignac number, because 18005951919 - 2³ = 18005951911 is a prime.

It is a super-2 number, since 2×18005951919² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18005951911) 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 15 ways as a sum of consecutive naturals, for example, 291462 + ... + 347795.

It is an arithmetic number, because the mean of its divisors is an integer number (1543808070).

Almost surely, 2^18005951919 is an apocalyptic number.

18005951919 is a deficient number, since it is larger than the sum of its proper divisors (6694977201).

18005951919 is a wasteful number, since it uses less digits than its factorization.

18005951919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639530.

The product of its (nonzero) digits is 145800, while the sum is 48.

The spelling of 18005951919 in words is "eighteen billion, five million, nine hundred fifty-one thousand, nine hundred nineteen".