1666127417 has 4 divisors (see below), whose sum is σ = 1666807440. Its totient is φ = 1665447396.

The previous prime is 1666127389. The next prime is 1666127431. The reversal of 1666127417 is 7147216661.

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 a cyclic number.

It is not a de Polignac number, because 1666127417 - 2¹⁰ = 1666126393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666127447) 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, 336323 + ... + 341240.

It is an arithmetic number, because the mean of its divisors is an integer number (416701860).

Almost surely, 2^1666127417 is an apocalyptic number.

It is an amenable number.

1666127417 is a deficient number, since it is larger than the sum of its proper divisors (680023).

1666127417 is an equidigital number, since it uses as much as digits as its factorization.

1666127417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680022.

The product of its digits is 84672, while the sum is 41.

The square root of 1666127417 is about 40818.2240794477. The cubic root of 1666127417 is about 1185.5032174682.

The spelling of 1666127417 in words is "one billion, six hundred sixty-six million, one hundred twenty-seven thousand, four hundred seventeen".