8166640742065 has 16 divisors (see below), whose sum is σ = 10558884336336. Its totient is φ = 6027851980800.

The previous prime is 8166640742033. The next prime is 8166640742129. The reversal of 8166640742065 is 5602470466618.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 51304062016 + 8115336680049 = 226504^2 + 2848743^2 .

It is not a de Polignac number, because 8166640742065 - 2⁵ = 8166640742033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8166640741997 and 8166640742015.

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, 30052296 + ... + 30322825.

It is an arithmetic number, because the mean of its divisors is an integer number (659930271021).

Almost surely, 2^{8166640742065} is an apocalyptic number.

It is an amenable number.

8166640742065 is a deficient number, since it is larger than the sum of its proper divisors (2392243594271).

8166640742065 is a wasteful number, since it uses less digits than its factorization.

8166640742065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60377220.

The product of its (nonzero) digits is 11612160, while the sum is 55.

The spelling of 8166640742065 in words is "eight trillion, one hundred sixty-six billion, six hundred forty million, seven hundred forty-two thousand, sixty-five".