1666045163 has 4 divisors (see below), whose sum is σ = 1666233408. Its totient is φ = 1665856920.

The previous prime is 1666045123. The next prime is 1666045177. The reversal of 1666045163 is 3615406661.

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 1666045163 - 2¹² = 1666041067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666045123) 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, 80156 + ... + 98777.

It is an arithmetic number, because the mean of its divisors is an integer number (416558352).

Almost surely, 2^1666045163 is an apocalyptic number.

1666045163 is a deficient number, since it is larger than the sum of its proper divisors (188245).

1666045163 is an equidigital number, since it uses as much as digits as its factorization.

1666045163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188244.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 1666045163 is about 40817.2165023535. The cubic root of 1666045163 is about 1185.4837083587.

The spelling of 1666045163 in words is "one billion, six hundred sixty-six million, forty-five thousand, one hundred sixty-three".