1666015060549 has 4 divisors (see below), whose sum is σ = 1904017212064. Its totient is φ = 1428012909036.

The previous prime is 1666015060531. The next prime is 1666015060561. The reversal of 1666015060549 is 9450605106661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1666015060549 - 2¹⁷ = 1666014929477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666015060649) 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 3 ways as a sum of consecutive naturals, for example, 119001075747 + ... + 119001075760.

It is an arithmetic number, because the mean of its divisors is an integer number (476004303016).

Almost surely, 2^{1666015060549} is an apocalyptic number.

It is an amenable number.

1666015060549 is a deficient number, since it is larger than the sum of its proper divisors (238002151515).

1666015060549 is an equidigital number, since it uses as much as digits as its factorization.

1666015060549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238002151514.

The product of its (nonzero) digits is 1166400, while the sum is 49.

The spelling of 1666015060549 in words is "one trillion, six hundred sixty-six billion, fifteen million, sixty thousand, five hundred forty-nine".