1265105265 has 16 divisors (see below), whose sum is σ = 2038946688. Its totient is φ = 669796736.

The previous prime is 1265105263. The next prime is 1265105267. The reversal of 1265105265 is 5625015621.

It is an interprime number because it is at equal distance from previous prime (1265105263) and next prime (1265105267).

It is a cyclic number.

It is not a de Polignac number, because 1265105265 - 2¹ = 1265105263 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1265105263) 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 15 ways as a sum of consecutive naturals, for example, 305757 + ... + 309866.

It is an arithmetic number, because the mean of its divisors is an integer number (127434168).

Almost surely, 2^1265105265 is an apocalyptic number.

1265105265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1265105265 is a deficient number, since it is larger than the sum of its proper divisors (773841423).

1265105265 is a wasteful number, since it uses less digits than its factorization.

1265105265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615768.

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 1265105265 is about 35568.3182762413. The cubic root of 1265105265 is about 1081.5390907753.

The spelling of 1265105265 in words is "one billion, two hundred sixty-five million, one hundred five thousand, two hundred sixty-five".