1664012111 has 8 divisors (see below), whose sum is σ = 1702779840. Its totient is φ = 1625384608.

The previous prime is 1664012099. The next prime is 1664012143. The reversal of 1664012111 is 1112104661.

It is a happy number.

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 1664012111 - 2²⁶ = 1596903247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664017111) 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, 10856 + ... + 58701.

It is an arithmetic number, because the mean of its divisors is an integer number (212847480).

Almost surely, 2^1664012111 is an apocalyptic number.

1664012111 is a deficient number, since it is larger than the sum of its proper divisors (38767729).

1664012111 is an equidigital number, since it uses as much as digits as its factorization.

1664012111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70113.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 1664012111 is about 40792.3045561292. The cubic root of 1664012111 is about 1185.0013022590.

Adding to 1664012111 its reverse (1112104661), we get a palindrome (2776116772).

The spelling of 1664012111 in words is "one billion, six hundred sixty-four million, twelve thousand, one hundred eleven".