1638115474118 has 8 divisors (see below), whose sum is σ = 2457193968648. Its totient is φ = 819050817904.

The previous prime is 1638115474109. The next prime is 1638115474139. The reversal of 1638115474118 is 8114745118361.

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

It is a congruent number.

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, 3158396 + ... + 3640287.

It is an arithmetic number, because the mean of its divisors is an integer number (307149246081).

Almost surely, 2^{1638115474118} is an apocalyptic number.

1638115474118 is a deficient number, since it is larger than the sum of its proper divisors (819078494530).

1638115474118 is a wasteful number, since it uses less digits than its factorization.

1638115474118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6919158.

The product of its digits is 645120, while the sum is 50.

The spelling of 1638115474118 in words is "one trillion, six hundred thirty-eight billion, one hundred fifteen million, four hundred seventy-four thousand, one hundred eighteen".