1666670017 has 4 divisors (see below), whose sum is σ = 1667454256. Its totient is φ = 1665885780.

The previous prime is 1666670003. The next prime is 1666670023. The reversal of 1666670017 is 7100766661.

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 a de Polignac number, because none of the positive numbers 2^k-1666670017 is a prime.

It is a super-3 number, since 3×1666670017³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666670087) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 388923 + ... + 393184.

It is an arithmetic number, because the mean of its divisors is an integer number (416863564).

Almost surely, 2^1666670017 is an apocalyptic number.

It is an amenable number.

1666670017 is a deficient number, since it is larger than the sum of its proper divisors (784239).

1666670017 is an equidigital number, since it uses as much as digits as its factorization.

1666670017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784238.

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 1666670017 is about 40824.8700794014. The cubic root of 1666670017 is about 1185.6318959480.

The spelling of 1666670017 in words is "one billion, six hundred sixty-six million, six hundred seventy thousand, seventeen".