It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1111800761 = 257 ⋅4326073.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-1670081111 is a prime.
It is a Duffinian number.
It is a congruent number.
Almost surely, 21670081111 is an apocalyptic number.
1670081111 is an equidigital number, since it uses as much as digits as its factorization.
1670081111 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 86112.
The square root of 1670081111 is about 40866.6258822526. The cubic root of 1670081111 is about 1186.4402035004.
Adding to 1670081111 its reverse (1111800761), we get a palindrome (2781881872).
The spelling of 1670081111 in words is "one billion, six hundred seventy million, eighty-one thousand, one hundred eleven".