18475406457938 has 8 divisors (see below), whose sum is σ = 28462112651532. Its totient is φ = 8988035574096.

The previous prime is 18475406457929. The next prime is 18475406457953. The reversal of 18475406457938 is 83975460457481.

It can be written as a sum of positive squares in 2 ways, for example, as 14022306261769 + 4453100196169 = 3744637^2 + 2110237^2 .

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, 124833827345 + ... + 124833827492.

Almost surely, 2^{18475406457938} is an apocalyptic number.

18475406457938 is a deficient number, since it is larger than the sum of its proper divisors (9986706193594).

18475406457938 is a wasteful number, since it uses less digits than its factorization.

18475406457938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249667654876.

The product of its (nonzero) digits is 812851200, while the sum is 71.

The spelling of 18475406457938 in words is "eighteen trillion, four hundred seventy-five billion, four hundred six million, four hundred fifty-seven thousand, nine hundred thirty-eight".