18481887138434 has 8 divisors (see below), whose sum is σ = 27925187136588. Its totient is φ = 9173491426240.

The previous prime is 18481887138371. The next prime is 18481887138527. The reversal of 18481887138434 is 43483178818481.

It can be written as a sum of positive squares in 2 ways, for example, as 18321524533225 + 160362605209 = 4280365^2 + 400453^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33726071147 + ... + 33726071694.

Almost surely, 2^{18481887138434} is an apocalyptic number.

18481887138434 is a deficient number, since it is larger than the sum of its proper divisors (9443299998154).

18481887138434 is a wasteful number, since it uses less digits than its factorization.

18481887138434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67452142980.

The product of its digits is 132120576, while the sum is 68.

The spelling of 18481887138434 in words is "eighteen trillion, four hundred eighty-one billion, eight hundred eighty-seven million, one hundred thirty-eight thousand, four hundred thirty-four".