18918029911 has 8 divisors (see below), whose sum is σ = 21349501200. Its totient is φ = 16605167040.

The previous prime is 18918029909. The next prime is 18918029917. The reversal of 18918029911 is 11992081981.

It is a happy number.

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

It is not a de Polignac number, because 18918029911 - 2¹ = 18918029909 is a prime.

It is a super-3 number, since 3×18918029911³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18918029917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29651766 + ... + 29652403.

It is an arithmetic number, because the mean of its divisors is an integer number (2668687650).

Almost surely, 2^18918029911 is an apocalyptic number.

18918029911 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18918029911 is a deficient number, since it is larger than the sum of its proper divisors (2431471289).

18918029911 is a wasteful number, since it uses less digits than its factorization.

18918029911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59304209.

The product of its (nonzero) digits is 93312, while the sum is 49.

The spelling of 18918029911 in words is "eighteen billion, nine hundred eighteen million, twenty-nine thousand, nine hundred eleven".