668022101 has 2 divisors, whose sum is σ = 668022102. Its totient is φ = 668022100.

The previous prime is 668022067. The next prime is 668022107. The reversal of 668022101 is 101220866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 495730225 + 172291876 = 22265^2 + 13126^2 .

It is a cyclic number.

It is not a de Polignac number, because 668022101 - 2¹⁸ = 667759957 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668022107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334011050 + 334011051.

It is an arithmetic number, because the mean of its divisors is an integer number (334011051).

Almost surely, 2^668022101 is an apocalyptic number.

It is an amenable number.

668022101 is a deficient number, since it is larger than the sum of its proper divisors (1).

668022101 is an equidigital number, since it uses as much as digits as its factorization.

668022101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 668022101 is about 25846.1235197853. The cubic root of 668022101 is about 874.1721044303.

Adding to 668022101 its reverse (101220866), we get a palindrome (769242967).

The spelling of 668022101 in words is "six hundred sixty-eight million, twenty-two thousand, one hundred one".