65666898392065 has 64 divisors (see below), whose sum is σ = 85539242032128. Its totient is φ = 48204914688000.

The previous prime is 65666898392047. The next prime is 65666898392093. The reversal of 65666898392065 is 56029389866656.

It is not a de Polignac number, because 65666898392065 - 2¹⁹ = 65666897867777 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5221183057 + ... + 5221195633.

It is an arithmetic number, because the mean of its divisors is an integer number (1336550656752).

Almost surely, 2^{65666898392065} is an apocalyptic number.

It is an amenable number.

65666898392065 is a deficient number, since it is larger than the sum of its proper divisors (19872343640063).

65666898392065 is a wasteful number, since it uses less digits than its factorization.

65666898392065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17578.

The product of its (nonzero) digits is 6046617600, while the sum is 79.

The spelling of 65666898392065 in words is "sixty-five trillion, six hundred sixty-six billion, eight hundred ninety-eight million, three hundred ninety-two thousand, sixty-five".