266403101 has 2 divisors, whose sum is σ = 266403102. Its totient is φ = 266403100.

The previous prime is 266403083. The next prime is 266403121. The reversal of 266403101 is 101304662.

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., 244171876 + 22231225 = 15626^2 + 4715^2 .

It is a cyclic number.

It is not a de Polignac number, because 266403101 - 2¹⁸ = 266140957 is a prime.

It is a super-2 number, since 2×266403101² = 141941224444832402, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266403121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133201550 + 133201551.

It is an arithmetic number, because the mean of its divisors is an integer number (133201551).

Almost surely, 2^266403101 is an apocalyptic number.

It is an amenable number.

266403101 is a deficient number, since it is larger than the sum of its proper divisors (1).

266403101 is an equidigital number, since it uses as much as digits as its factorization.

266403101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 266403101 is about 16321.8596060620. The cubic root of 266403101 is about 643.4474616235.

Adding to 266403101 its reverse (101304662), we get a palindrome (367707763).

The spelling of 266403101 in words is "two hundred sixty-six million, four hundred three thousand, one hundred one".