18505721134 has 4 divisors (see below), whose sum is σ = 27758581704. Its totient is φ = 9252860566.

The previous prime is 18505721123. The next prime is 18505721141. The reversal of 18505721134 is 43112750581.

It is a semiprime because it is the product of two primes.

It is a super-3 number, since 3×18505721134³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18505721093 and 18505721102.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4626430282 + ... + 4626430285.

It is an arithmetic number, because the mean of its divisors is an integer number (6939645426).

Almost surely, 2^18505721134 is an apocalyptic number.

18505721134 is a deficient number, since it is larger than the sum of its proper divisors (9252860570).

18505721134 is an equidigital number, since it uses as much as digits as its factorization.

18505721134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9252860569.

The product of its (nonzero) digits is 33600, while the sum is 37.

The spelling of 18505721134 in words is "eighteen billion, five hundred five million, seven hundred twenty-one thousand, one hundred thirty-four".