669164101 has 2 divisors, whose sum is σ = 669164102. Its totient is φ = 669164100.

The previous prime is 669164099. The next prime is 669164123. The reversal of 669164101 is 101461966.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 556252225 + 112911876 = 23585^2 + 10626^2 .

It is a cyclic number.

It is not a de Polignac number, because 669164101 - 2¹ = 669164099 is a prime.

Together with 669164099, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669164141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334582050 + 334582051.

It is an arithmetic number, because the mean of its divisors is an integer number (334582051).

Almost surely, 2^669164101 is an apocalyptic number.

It is an amenable number.

669164101 is a deficient number, since it is larger than the sum of its proper divisors (1).

669164101 is an equidigital number, since it uses as much as digits as its factorization.

669164101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 669164101 is about 25868.2063738482. The cubic root of 669164101 is about 874.6699603177.

It can be divided in two parts, 66916 and 4101, that added together give a palindrome (71017).

The spelling of 669164101 in words is "six hundred sixty-nine million, one hundred sixty-four thousand, one hundred one".