1205648355665 has 16 divisors (see below), whose sum is σ = 1558091941056. Its totient is φ = 890311627200.

The previous prime is 1205648355607. The next prime is 1205648355673. The reversal of 1205648355665 is 5665538465021.

It is a happy number.

It is not a de Polignac number, because 1205648355665 - 2²⁰ = 1205647307089 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1205648355665.

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, 7234730 + ... + 7399500.

It is an arithmetic number, because the mean of its divisors is an integer number (97380746316).

Almost surely, 2^{1205648355665} is an apocalyptic number.

It is an amenable number.

1205648355665 is a deficient number, since it is larger than the sum of its proper divisors (352443585391).

1205648355665 is a wasteful number, since it uses less digits than its factorization.

1205648355665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277360.

The product of its (nonzero) digits is 25920000, while the sum is 56.

The spelling of 1205648355665 in words is "one trillion, two hundred five billion, six hundred forty-eight million, three hundred fifty-five thousand, six hundred sixty-five".