18073469787638 has 4 divisors (see below), whose sum is σ = 27110204681460. Its totient is φ = 9036734893818.

The previous prime is 18073469787631. The next prime is 18073469787679. The reversal of 18073469787638 is 83678796437081.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18073469787631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4518367446908 + ... + 4518367446911.

It is an arithmetic number, because the mean of its divisors is an integer number (6777551170365).

Almost surely, 2^{18073469787638} is an apocalyptic number.

18073469787638 is a deficient number, since it is larger than the sum of its proper divisors (9036734893822).

18073469787638 is an equidigital number, since it uses as much as digits as its factorization.

18073469787638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9036734893821.

The product of its (nonzero) digits is 2048385024, while the sum is 77.

The spelling of 18073469787638 in words is "eighteen trillion, seventy-three billion, four hundred sixty-nine million, seven hundred eighty-seven thousand, six hundred thirty-eight".