138268149273 has 6 divisors (see below), whose sum is σ = 199720660074. Its totient is φ = 92178766176.

The previous prime is 138268149269. The next prime is 138268149289. The reversal of 138268149273 is 372941862831.

It is a happy number.

138268149273 is a `hidden beast` number, since 1 + 3 + 8 + 2 + 6 + 81 + 492 + 73 = 666.

It can be written as a sum of positive squares in only one way, i.e., 137334724569 + 933424704 = 370587^2 + 30552^2 .

It is not a de Polignac number, because 138268149273 - 2² = 138268149269 is a prime.

It is a super-2 number, since 2×138268149273² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138268149073) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7681563840 + ... + 7681563857.

It is an arithmetic number, because the mean of its divisors is an integer number (33286776679).

Almost surely, 2^138268149273 is an apocalyptic number.

It is an amenable number.

138268149273 is a deficient number, since it is larger than the sum of its proper divisors (61452510801).

138268149273 is a wasteful number, since it uses less digits than its factorization.

138268149273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15363127703 (or 15363127700 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 54.

The spelling of 138268149273 in words is "one hundred thirty-eight billion, two hundred sixty-eight million, one hundred forty-nine thousand, two hundred seventy-three".