1666353505003 has 4 divisors (see below), whose sum is σ = 1817840187288. Its totient is φ = 1514866822720.

The previous prime is 1666353504997. The next prime is 1666353505043. The reversal of 1666353505003 is 3005053536661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1666353505003 - 2¹³ = 1666353496811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666353505043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75743341126 + ... + 75743341147.

It is an arithmetic number, because the mean of its divisors is an integer number (454460046822).

Almost surely, 2^{1666353505003} is an apocalyptic number.

1666353505003 is a deficient number, since it is larger than the sum of its proper divisors (151486682285).

1666353505003 is a wasteful number, since it uses less digits than its factorization.

1666353505003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151486682284.

The product of its (nonzero) digits is 729000, while the sum is 43.

The spelling of 1666353505003 in words is "one trillion, six hundred sixty-six billion, three hundred fifty-three million, five hundred five thousand, three".