1666245406423 has 8 divisors (see below), whose sum is σ = 1795868768288. Its totient is φ = 1536829278624.

The previous prime is 1666245406403. The next prime is 1666245406477. The reversal of 1666245406423 is 3246045426661.

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 1666245406423 - 2⁵ = 1666245406391 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 (1666245406403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51791811 + ... + 51823972.

It is an arithmetic number, because the mean of its divisors is an integer number (224483596036).

Almost surely, 2^{1666245406423} is an apocalyptic number.

1666245406423 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1666245406423 is a deficient number, since it is larger than the sum of its proper divisors (129623361865).

1666245406423 is a wasteful number, since it uses less digits than its factorization.

1666245406423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103617033.

The product of its (nonzero) digits is 4976640, while the sum is 49.

The spelling of 1666245406423 in words is "one trillion, six hundred sixty-six billion, two hundred forty-five million, four hundred six thousand, four hundred twenty-three".