66075045561 has 12 divisors (see below), whose sum is σ = 109076265792. Its totient is φ = 37757168856.

The previous prime is 66075045559. The next prime is 66075045599. The reversal of 66075045561 is 16554057066.

It is not a de Polignac number, because 66075045561 - 2¹ = 66075045559 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66075045061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 524405061 + ... + 524405186.

It is an arithmetic number, because the mean of its divisors is an integer number (9089688816).

Almost surely, 2^66075045561 is an apocalyptic number.

It is an amenable number.

66075045561 is a deficient number, since it is larger than the sum of its proper divisors (43001220231).

66075045561 is a wasteful number, since it uses less digits than its factorization.

66075045561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1048810260 (or 1048810257 counting only the distinct ones).

The product of its (nonzero) digits is 756000, while the sum is 45.

The spelling of 66075045561 in words is "sixty-six billion, seventy-five million, forty-five thousand, five hundred sixty-one".