1668125135 has 4 divisors (see below), whose sum is σ = 2001750168. Its totient is φ = 1334500104.

The previous prime is 1668125111. The next prime is 1668125189. The reversal of 1668125135 is 5315218661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5315218661 = 179 ⋅29693959.

It is a cyclic number.

It is not a de Polignac number, because 1668125135 - 2⁸ = 1668124879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166812509 + ... + 166812518.

It is an arithmetic number, because the mean of its divisors is an integer number (500437542).

Almost surely, 2^1668125135 is an apocalyptic number.

1668125135 is a deficient number, since it is larger than the sum of its proper divisors (333625033).

1668125135 is an equidigital number, since it uses as much as digits as its factorization.

1668125135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333625032.

The product of its digits is 43200, while the sum is 38.

The square root of 1668125135 is about 40842.6876564214. The cubic root of 1668125135 is about 1185.9768417494.

The spelling of 1668125135 in words is "one billion, six hundred sixty-eight million, one hundred twenty-five thousand, one hundred thirty-five".