1265558223 has 4 divisors (see below), whose sum is σ = 1687410968. Its totient is φ = 843705480.

The previous prime is 1265558197. The next prime is 1265558267. The reversal of 1265558223 is 3228555621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3228555621 = 3 ⋅1076185207.

It is not a de Polignac number, because 1265558223 - 2¹⁰ = 1265557199 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 (1265558293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210926368 + ... + 210926373.

It is an arithmetic number, because the mean of its divisors is an integer number (421852742).

Almost surely, 2^1265558223 is an apocalyptic number.

1265558223 is a deficient number, since it is larger than the sum of its proper divisors (421852745).

1265558223 is an equidigital number, since it uses as much as digits as its factorization.

1265558223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421852744.

The product of its digits is 144000, while the sum is 39.

The square root of 1265558223 is about 35574.6851426685. The cubic root of 1265558223 is about 1081.6681533763.

The spelling of 1265558223 in words is "one billion, two hundred sixty-five million, five hundred fifty-eight thousand, two hundred twenty-three".