1266221053 has 2 divisors, whose sum is σ = 1266221054. Its totient is φ = 1266221052.

The previous prime is 1266221041. The next prime is 1266221059. The reversal of 1266221053 is 3501226621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1169434809 + 96786244 = 34197^2 + 9838^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1266221053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1266221059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633110526 + 633110527.

It is an arithmetic number, because the mean of its divisors is an integer number (633110527).

Almost surely, 2^1266221053 is an apocalyptic number.

It is an amenable number.

1266221053 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266221053 is an equidigital number, since it uses as much as digits as its factorization.

1266221053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 1266221053 is about 35583.9999578462. Note that the first 4 decimals coincide. The cubic root of 1266221053 is about 1081.8569599064.

Adding to 1266221053 its reverse (3501226621), we get a palindrome (4767447674).

The spelling of 1266221053 in words is "one billion, two hundred sixty-six million, two hundred twenty-one thousand, fifty-three".