668133101 has 2 divisors, whose sum is σ = 668133102. Its totient is φ = 668133100.

The previous prime is 668133077. The next prime is 668133113. The reversal of 668133101 is 101331866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 548777476 + 119355625 = 23426^2 + 10925^2 .

It is a cyclic number.

It is not a de Polignac number, because 668133101 - 2¹⁰ = 668132077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668133121) 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 as a sum of consecutive naturals, namely, 334066550 + 334066551.

It is an arithmetic number, because the mean of its divisors is an integer number (334066551).

Almost surely, 2^668133101 is an apocalyptic number.

It is an amenable number.

668133101 is a deficient number, since it is larger than the sum of its proper divisors (1).

668133101 is an equidigital number, since it uses as much as digits as its factorization.

668133101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 668133101 is about 25848.2707545398. The cubic root of 668133101 is about 874.2205198593.

Adding to 668133101 its reverse (101331866), we get a palindrome (769464967).

The spelling of 668133101 in words is "six hundred sixty-eight million, one hundred thirty-three thousand, one hundred one".