138123272365 has 16 divisors (see below), whose sum is σ = 180135370800. Its totient is φ = 101062950912.

The previous prime is 138123272297. The next prime is 138123272381. The reversal of 138123272365 is 563272321831.

It can be written as a sum of positive squares in 8 ways, for example, as 6339025924 + 131784246441 = 79618^2 + 363021^2 .

It is a cyclic number.

It is not a de Polignac number, because 138123272365 - 2³¹ = 135975788717 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9740500 + ... + 9754669.

It is an arithmetic number, because the mean of its divisors is an integer number (11258460675).

Almost surely, 2^138123272365 is an apocalyptic number.

It is an amenable number.

138123272365 is a deficient number, since it is larger than the sum of its proper divisors (42012098435).

138123272365 is a wasteful number, since it uses less digits than its factorization.

138123272365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19495296.

The product of its digits is 362880, while the sum is 43.

The spelling of 138123272365 in words is "one hundred thirty-eight billion, one hundred twenty-three million, two hundred seventy-two thousand, three hundred sixty-five".