666264206424101 has 2 divisors, whose sum is σ = 666264206424102. Its totient is φ = 666264206424100.

The previous prime is 666264206424073. The next prime is 666264206424133. The reversal of 666264206424101 is 101424602462666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 507330530952001 + 158933675472100 = 22523999^2 + 12606890^2 .

It is a cyclic number.

It is not a de Polignac number, because 666264206424101 - 2¹⁰ = 666264206423077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 666264206424101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666264206421101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333132103212050 + 333132103212051.

It is an arithmetic number, because the mean of its divisors is an integer number (333132103212051).

Almost surely, 2^{666264206424101} is an apocalyptic number.

It is an amenable number.

666264206424101 is a deficient number, since it is larger than the sum of its proper divisors (1).

666264206424101 is an equidigital number, since it uses as much as digits as its factorization.

666264206424101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3981312, while the sum is 50.

Adding to 666264206424101 its reverse (101424602462666), we get a palindrome (767688808886767).

The spelling of 666264206424101 in words is "six hundred sixty-six trillion, two hundred sixty-four billion, two hundred six million, four hundred twenty-four thousand, one hundred one".