668145135 has 64 divisors (see below), whose sum is σ = 1320192000. Its totient is φ = 287433216.

The previous prime is 668145133. The next prime is 668145151. The reversal of 668145135 is 531541866.

It is not a de Polignac number, because 668145135 - 2¹ = 668145133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 668145093 and 668145102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668145131) 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 63 ways as a sum of consecutive naturals, for example, 83646 + ... + 91284.

It is an arithmetic number, because the mean of its divisors is an integer number (20628000).

Almost surely, 2^668145135 is an apocalyptic number.

668145135 is a deficient number, since it is larger than the sum of its proper divisors (652046865).

668145135 is a wasteful number, since it uses less digits than its factorization.

668145135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7685 (or 7671 counting only the distinct ones).

The product of its digits is 86400, while the sum is 39.

The square root of 668145135 is about 25848.5035350211. The cubic root of 668145135 is about 874.2257684674.

The spelling of 668145135 in words is "six hundred sixty-eight million, one hundred forty-five thousand, one hundred thirty-five".