1266266513 has 4 divisors (see below), whose sum is σ = 1290158388. Its totient is φ = 1242374640.

The previous prime is 1266266497. The next prime is 1266266531. The reversal of 1266266513 is 3156626621.

It is a happy number.

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 775511104 + 490755409 = 27848^2 + 22153^2 .

It is a cyclic number.

It is not a de Polignac number, because 1266266513 - 2⁴ = 1266266497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1266266543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11945858 + ... + 11945963.

It is an arithmetic number, because the mean of its divisors is an integer number (322539597).

Almost surely, 2^1266266513 is an apocalyptic number.

It is an amenable number.

1266266513 is a deficient number, since it is larger than the sum of its proper divisors (23891875).

1266266513 is an equidigital number, since it uses as much as digits as its factorization.

1266266513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23891874.

The product of its digits is 77760, while the sum is 38.

The square root of 1266266513 is about 35584.6387223476. The cubic root of 1266266513 is about 1081.8699067318.

The spelling of 1266266513 in words is "one billion, two hundred sixty-six million, two hundred sixty-six thousand, five hundred thirteen".