2016138728465 has 32 divisors (see below), whose sum is σ = 2494696475040. Its totient is φ = 1563593932800.

The previous prime is 2016138728441. The next prime is 2016138728503. The reversal of 2016138728465 is 5648278316102.

It is a Cunningham number, because it is equal to 1419908²+1.

It can be written as a sum of positive squares in 16 ways, for example, as 520243395841 + 1495895332624 = 721279^2 + 1223068^2 .

It is not a de Polignac number, because 2016138728465 - 2²⁸ = 2015870293009 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6988601 + ... + 7271369.

It is an arithmetic number, because the mean of its divisors is an integer number (77959264845).

Almost surely, 2^{2016138728465} is an apocalyptic number.

It is an amenable number.

2016138728465 is a deficient number, since it is larger than the sum of its proper divisors (478557746575).

2016138728465 is a wasteful number, since it uses less digits than its factorization.

2016138728465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283173.

The product of its (nonzero) digits is 3870720, while the sum is 53.

The spelling of 2016138728465 in words is "two trillion, sixteen billion, one hundred thirty-eight million, seven hundred twenty-eight thousand, four hundred sixty-five".