668145133 has 2 divisors, whose sum is σ = 668145134. Its totient is φ = 668145132.

The previous prime is 668145131. The next prime is 668145151. The reversal of 668145133 is 331541866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 664711524 + 3433609 = 25782^2 + 1853^2 .

It is a cyclic number.

It is not a de Polignac number, because 668145133 - 2¹ = 668145131 is a prime.

Together with 668145131, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 668145092 and 668145101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668145131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334072566 + 334072567.

It is an arithmetic number, because the mean of its divisors is an integer number (334072567).

Almost surely, 2^668145133 is an apocalyptic number.

It is an amenable number.

668145133 is a deficient number, since it is larger than the sum of its proper divisors (1).

668145133 is an equidigital number, since it uses as much as digits as its factorization.

668145133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 37.

The square root of 668145133 is about 25848.5034963342. The cubic root of 668145133 is about 874.2257675951.

Adding to 668145133 its reverse (331541866), we get a palindrome (999686999).

The spelling of 668145133 in words is "six hundred sixty-eight million, one hundred forty-five thousand, one hundred thirty-three".