138618885075818 has 24 divisors (see below), whose sum is σ = 241879717924452. Its totient is φ = 59407133682624.

The previous prime is 138618885075817. The next prime is 138618885075841. The reversal of 138618885075818 is 818570588816831.

It can be written as a sum of positive squares in 2 ways, for example, as 132636981676969 + 5981903398849 = 11516813^2 + 2445793^2 .

It is not an unprimeable number, because it can be changed into a prime (138618885075817) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5315021 + ... + 17478192.

Almost surely, 2^{138618885075818} is an apocalyptic number.

138618885075818 is a deficient number, since it is larger than the sum of its proper divisors (103260832848634).

138618885075818 is a wasteful number, since it uses less digits than its factorization.

138618885075818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22855286 (or 22855279 counting only the distinct ones).

The product of its (nonzero) digits is 825753600, while the sum is 77.

The spelling of 138618885075818 in words is "one hundred thirty-eight trillion, six hundred eighteen billion, eight hundred eighty-five million, seventy-five thousand, eight hundred eighteen".