20127122457065 has 16 divisors (see below), whose sum is σ = 26436835757136. Its totient is φ = 14619448339200.

The previous prime is 20127122457041. The next prime is 20127122457097. The reversal of 20127122457065 is 56075422172102.

It can be written as a sum of positive squares in 8 ways, for example, as 4491907225744 + 15635215231321 = 2119412^2 + 3954139^2 .

It is not a de Polignac number, because 20127122457065 - 2³⁴ = 20109942587881 is a prime.

It is a Duffinian 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, 2538094706 + ... + 2538102635.

It is an arithmetic number, because the mean of its divisors is an integer number (1652302234821).

Almost surely, 2^{20127122457065} is an apocalyptic number.

It is an amenable number.

20127122457065 is a deficient number, since it is larger than the sum of its proper divisors (6309713300071).

20127122457065 is a wasteful number, since it uses less digits than its factorization.

20127122457065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5076197420.

The product of its (nonzero) digits is 470400, while the sum is 44.

The spelling of 20127122457065 in words is "twenty trillion, one hundred twenty-seven billion, one hundred twenty-two million, four hundred fifty-seven thousand, sixty-five".