1266263653 has 4 divisors (see below), whose sum is σ = 1266730048. Its totient is φ = 1265797260.

The previous prime is 1266263611. The next prime is 1266263701. The reversal of 1266263653 is 3563626621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1266263653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266263153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229101 + ... + 234562.

It is an arithmetic number, because the mean of its divisors is an integer number (316682512).

Almost surely, 2^1266263653 is an apocalyptic number.

It is an amenable number.

1266263653 is a deficient number, since it is larger than the sum of its proper divisors (466395).

1266263653 is an equidigital number, since it uses as much as digits as its factorization.

1266263653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466394.

The product of its digits is 233280, while the sum is 40.

The square root of 1266263653 is about 35584.5985364455. The cubic root of 1266263653 is about 1081.8690922244.

The spelling of 1266263653 in words is "one billion, two hundred sixty-six million, two hundred sixty-three thousand, six hundred fifty-three".