665787532545 has 12 divisors (see below), whose sum is σ = 1154031723156. Its totient is φ = 355086684000.

The previous prime is 665787532511. The next prime is 665787532583. The reversal of 665787532545 is 545235787566.

665787532545 is a `hidden beast` number, since 6 + 6 + 5 + 7 + 87 + 5 + 3 + 2 + 545 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 280522766736 + 385264765809 = 529644^2 + 620697^2 .

It is not a de Polignac number, because 665787532545 - 2¹² = 665787528449 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7397639206 + ... + 7397639295.

It is an arithmetic number, because the mean of its divisors is an integer number (96169310263).

Almost surely, 2^665787532545 is an apocalyptic number.

It is an amenable number.

665787532545 is a deficient number, since it is larger than the sum of its proper divisors (488244190611).

665787532545 is a wasteful number, since it uses less digits than its factorization.

665787532545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14795278512 (or 14795278509 counting only the distinct ones).

The product of its digits is 211680000, while the sum is 63.

The spelling of 665787532545 in words is "six hundred sixty-five billion, seven hundred eighty-seven million, five hundred thirty-two thousand, five hundred forty-five".