66205565607 has 32 divisors (see below), whose sum is σ = 96160331520. Its totient is φ = 40373199360.

The previous prime is 66205565603. The next prime is 66205565623. The reversal of 66205565607 is 70656550266.

66205565607 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66205565607 - 2² = 66205565603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66205565603) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 156463 + ... + 396095.

It is an arithmetic number, because the mean of its divisors is an integer number (3005010360).

Almost surely, 2^66205565607 is an apocalyptic number.

66205565607 is a deficient number, since it is larger than the sum of its proper divisors (29954765913).

66205565607 is a wasteful number, since it uses less digits than its factorization.

66205565607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239823.

The product of its (nonzero) digits is 2268000, while the sum is 48.

The spelling of 66205565607 in words is "sixty-six billion, two hundred five million, five hundred sixty-five thousand, six hundred seven".