66566150555 has 16 divisors (see below), whose sum is σ = 84584541600. Its totient is φ = 50116618752.

The previous prime is 66566150503. The next prime is 66566150569. The reversal of 66566150555 is 55505166566.

It is a cyclic number.

It is not a de Polignac number, because 66566150555 - 2²⁰ = 66565101979 is a prime.

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, 1693232 + ... + 1732098.

It is an arithmetic number, because the mean of its divisors is an integer number (5286533850).

Almost surely, 2^66566150555 is an apocalyptic number.

66566150555 is a deficient number, since it is larger than the sum of its proper divisors (18018391045).

66566150555 is a wasteful number, since it uses less digits than its factorization.

66566150555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59038.

The product of its (nonzero) digits is 4050000, while the sum is 50.

The spelling of 66566150555 in words is "sixty-six billion, five hundred sixty-six million, one hundred fifty thousand, five hundred fifty-five".