1265828663 has 8 divisors (see below), whose sum is σ = 1393574160. Its totient is φ = 1140194880.

The previous prime is 1265828651. The next prime is 1265828677. The reversal of 1265828663 is 3668285621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1265828663 - 2⁸ = 1265828407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265828693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 526670 + ... + 529067.

It is an arithmetic number, because the mean of its divisors is an integer number (174196770).

Almost surely, 2^1265828663 is an apocalyptic number.

1265828663 is a deficient number, since it is larger than the sum of its proper divisors (127745497).

1265828663 is a wasteful number, since it uses less digits than its factorization.

1265828663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055857.

The product of its digits is 829440, while the sum is 47.

The square root of 1265828663 is about 35578.4859571062. The cubic root of 1265828663 is about 1081.7451959271.

It can be divided in two parts, 1265 and 828663, that added together give a palindrome (829928).

The spelling of 1265828663 in words is "one billion, two hundred sixty-five million, eight hundred twenty-eight thousand, six hundred sixty-three".