1666664437145 has 8 divisors (see below), whose sum is σ = 2000783811456. Its totient is φ = 1332807225136.

The previous prime is 1666664437073. The next prime is 1666664437183. The reversal of 1666664437145 is 5417344666661.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1666664437145 - 2¹⁰ = 1666664436121 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65526587 + ... + 65552016.

It is an arithmetic number, because the mean of its divisors is an integer number (250097976432).

Almost surely, 2^{1666664437145} is an apocalyptic number.

It is an amenable number.

1666664437145 is a deficient number, since it is larger than the sum of its proper divisors (334119374311).

1666664437145 is a wasteful number, since it uses less digits than its factorization.

1666664437145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131081151.

The product of its digits is 52254720, while the sum is 59.

The spelling of 1666664437145 in words is "one trillion, six hundred sixty-six billion, six hundred sixty-four million, four hundred thirty-seven thousand, one hundred forty-five".