18475417538 has 18 divisors (see below), whose sum is σ = 27902696787. Its totient is φ = 9174946980.

The previous prime is 18475417537. The next prime is 18475417549. The reversal of 18475417538 is 83571457481.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 9237708769 + 9237708769 = 96113^2 + 96113^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=96113.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18475417538.

It is not an unprimeable number, because it can be changed into a prime (18475417531) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 42866183 + ... + 42866613.

Almost surely, 2^18475417538 is an apocalyptic number.

18475417538 is a deficient number, since it is larger than the sum of its proper divisors (9427279249).

18475417538 is an frugal number, since it uses more digits than its factorization.

18475417538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1310 (or 656 counting only the distinct ones).

The product of its digits is 3763200, while the sum is 53.

The spelling of 18475417538 in words is "eighteen billion, four hundred seventy-five million, four hundred seventeen thousand, five hundred thirty-eight".