318630238138 has 4 divisors (see below), whose sum is σ = 477945357210. Its totient is φ = 159315119068.

The previous prime is 318630238103. The next prime is 318630238141. The reversal of 318630238138 is 831832036813.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831832036813 = 311 ⋅2674701083.

It can be written as a sum of positive squares in only one way, i.e., 224057382409 + 94572855729 = 473347^2 + 307527^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79657559533 + ... + 79657559536.

Almost surely, 2^318630238138 is an apocalyptic number.

318630238138 is a deficient number, since it is larger than the sum of its proper divisors (159315119072).

318630238138 is a wasteful number, since it uses less digits than its factorization.

318630238138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159315119071.

The product of its (nonzero) digits is 497664, while the sum is 46.

The spelling of 318630238138 in words is "three hundred eighteen billion, six hundred thirty million, two hundred thirty-eight thousand, one hundred thirty-eight".