18511109934 has 32 divisors (see below), whose sum is σ = 37691879040. Its totient is φ = 6058994592.

The previous prime is 18511109933. The next prime is 18511109951. The reversal of 18511109934 is 43990111581.

It is a happy number.

It is a super-2 number, since 2×18511109934² (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 (18511109933) 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 15 ways as a sum of consecutive naturals, for example, 292252 + ... + 349904.

It is an arithmetic number, because the mean of its divisors is an integer number (1177871220).

Almost surely, 2^18511109934 is an apocalyptic number.

18511109934 is an abundant number, since it is smaller than the sum of its proper divisors (19180769106).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18511109934 is a wasteful number, since it uses less digits than its factorization.

18511109934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58624.

The product of its (nonzero) digits is 38880, while the sum is 42.

The spelling of 18511109934 in words is "eighteen billion, five hundred eleven million, one hundred nine thousand, nine hundred thirty-four".