138662718718 has 4 divisors (see below), whose sum is σ = 207994078080. Its totient is φ = 69331359358.

The previous prime is 138662718709. The next prime is 138662718743. The reversal of 138662718718 is 817817266831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 817817266831 = 31547 ⋅25923773.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34665679678 + ... + 34665679681.

It is an arithmetic number, because the mean of its divisors is an integer number (51998519520).

Almost surely, 2^138662718718 is an apocalyptic number.

138662718718 is a deficient number, since it is larger than the sum of its proper divisors (69331359362).

138662718718 is an equidigital number, since it uses as much as digits as its factorization.

138662718718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69331359361.

The product of its digits is 5419008, while the sum is 58.

The spelling of 138662718718 in words is "one hundred thirty-eight billion, six hundred sixty-two million, seven hundred eighteen thousand, seven hundred eighteen".