1666066516 has 6 divisors (see below), whose sum is σ = 2915616410. Its totient is φ = 833033256.

The previous prime is 1666066513. The next prime is 1666066579. The reversal of 1666066516 is 6156606661.

It can be written as a sum of positive squares in only one way, i.e., 1439443600 + 226622916 = 37940^2 + 15054^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666066513) by changing a digit.

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 as a sum of consecutive naturals, namely, 208258311 + ... + 208258318.

Almost surely, 2^1666066516 is an apocalyptic number.

It is an amenable number.

1666066516 is a deficient number, since it is larger than the sum of its proper divisors (1249549894).

1666066516 is a wasteful number, since it uses less digits than its factorization.

1666066516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416516633 (or 416516631 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 1666066516 is about 40817.4780700621. The cubic root of 1666066516 is about 1185.4887729524.

The spelling of 1666066516 in words is "one billion, six hundred sixty-six million, sixty-six thousand, five hundred sixteen".