1266211145 has 4 divisors (see below), whose sum is σ = 1519453380. Its totient is φ = 1012968912.

The previous prime is 1266211103. The next prime is 1266211189. The reversal of 1266211145 is 5411126621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 934096969 + 332114176 = 30563^2 + 18224^2 .

It is a cyclic number.

It is not a de Polignac number, because 1266211145 - 2⁶ = 1266211081 is a prime.

It is a super-2 number, since 2×1266211145² = 3206581327444422050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126621110 + ... + 126621119.

It is an arithmetic number, because the mean of its divisors is an integer number (379863345).

Almost surely, 2^1266211145 is an apocalyptic number.

It is an amenable number.

1266211145 is a deficient number, since it is larger than the sum of its proper divisors (253242235).

1266211145 is an equidigital number, since it uses as much as digits as its factorization.

1266211145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253242234.

The product of its digits is 2880, while the sum is 29.

The square root of 1266211145 is about 35583.8607376996. The cubic root of 1266211145 is about 1081.8541381066.

Adding to 1266211145 its reverse (5411126621), we get a palindrome (6677337766).

The spelling of 1266211145 in words is "one billion, two hundred sixty-six million, two hundred eleven thousand, one hundred forty-five".