1668011091 has 8 divisors (see below), whose sum is σ = 2254481040. Its totient is φ = 1096774272.

The previous prime is 1668011089. The next prime is 1668011099. The reversal of 1668011091 is 1901108661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1668011091 - 2¹ = 1668011089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1668011099) 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 7 ways as a sum of consecutive naturals, for example, 3808026 + ... + 3808463.

It is an arithmetic number, because the mean of its divisors is an integer number (281810130).

Almost surely, 2^1668011091 is an apocalyptic number.

1668011091 is a deficient number, since it is larger than the sum of its proper divisors (586469949).

1668011091 is an equidigital number, since it uses as much as digits as its factorization.

1668011091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7616565.

The product of its (nonzero) digits is 2592, while the sum is 33.

The square root of 1668011091 is about 40841.2914952502. The cubic root of 1668011091 is about 1185.9498140757.

The spelling of 1668011091 in words is "one billion, six hundred sixty-eight million, eleven thousand, ninety-one".