1666111323 has 8 divisors (see below), whose sum is σ = 2222001936. Its totient is φ = 1110480800.

The previous prime is 1666111313. The next prime is 1666111409. The reversal of 1666111323 is 3231116661.

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 1666111323 - 2⁶ = 1666111259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1666111313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49548 + ... + 76073.

It is an arithmetic number, because the mean of its divisors is an integer number (277750242).

Almost surely, 2^1666111323 is an apocalyptic number.

1666111323 is a deficient number, since it is larger than the sum of its proper divisors (555890613).

1666111323 is a wasteful number, since it uses less digits than its factorization.

1666111323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130045.

The product of its digits is 3888, while the sum is 30.

The square root of 1666111323 is about 40818.0269366367. The cubic root of 1666111323 is about 1185.4994003231.

Adding to 1666111323 its reverse (3231116661), we get a palindrome (4897227984).

The spelling of 1666111323 in words is "one billion, six hundred sixty-six million, one hundred eleven thousand, three hundred twenty-three".