2066556717 has 24 divisors (see below), whose sum is σ = 3146950560. Its totient is φ = 1303192800.

The previous prime is 2066556673. The next prime is 2066556721. The reversal of 2066556717 is 7176556602.

2066556717 is a `hidden beast` number, since 20 + 6 + 6 + 556 + 71 + 7 = 666.

It is not a de Polignac number, because 2066556717 - 2⁸ = 2066556461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2066556757) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 106842 + ... + 124692.

It is an arithmetic number, because the mean of its divisors is an integer number (131122940).

Almost surely, 2^2066556717 is an apocalyptic number.

It is an amenable number.

2066556717 is a deficient number, since it is larger than the sum of its proper divisors (1080393843).

2066556717 is a wasteful number, since it uses less digits than its factorization.

2066556717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18553 (or 18550 counting only the distinct ones).

The product of its (nonzero) digits is 529200, while the sum is 45.

The square root of 2066556717 is about 45459.3963554291. The cubic root of 2066556717 is about 1273.7448556957.

The spelling of 2066556717 in words is "two billion, sixty-six million, five hundred fifty-six thousand, seven hundred seventeen".