65984811545 has 16 divisors (see below), whose sum is σ = 81509730960. Its totient is φ = 51242471424.

The previous prime is 65984811539. The next prime is 65984811559. The reversal of 65984811545 is 54511848956.

It can be written as a sum of positive squares in 8 ways, for example, as 11428465216 + 54556346329 = 106904^2 + 233573^2 .

It is a cyclic number.

It is not a de Polignac number, because 65984811545 - 2⁸ = 65984811289 is a prime.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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, 331760 + ... + 491969.

It is an arithmetic number, because the mean of its divisors is an integer number (5094358185).

Almost surely, 2^65984811545 is an apocalyptic number.

It is an amenable number.

65984811545 is a deficient number, since it is larger than the sum of its proper divisors (15524919415).

65984811545 is a wasteful number, since it uses less digits than its factorization.

65984811545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824204.

The product of its digits is 6912000, while the sum is 56.

The spelling of 65984811545 in words is "sixty-five billion, nine hundred eighty-four million, eight hundred eleven thousand, five hundred forty-five".