1265163205 has 32 divisors (see below), whose sum is σ = 1630347264. Its totient is φ = 939165696.

The previous prime is 1265163191. The next prime is 1265163209. The reversal of 1265163205 is 5023615621.

It is a cyclic number.

It is not a de Polignac number, because 1265163205 - 2¹³ = 1265155013 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 (1265163209) 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 31 ways as a sum of consecutive naturals, for example, 2514984 + ... + 2515486.

It is an arithmetic number, because the mean of its divisors is an integer number (50948352).

Almost surely, 2^1265163205 is an apocalyptic number.

It is an amenable number.

1265163205 is a deficient number, since it is larger than the sum of its proper divisors (365184059).

1265163205 is a wasteful number, since it uses less digits than its factorization.

1265163205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 1265163205 is about 35569.1327558039. The cubic root of 1265163205 is about 1081.5556015010. Note that the first 3 decimals are identical.

Adding to 1265163205 its reverse (5023615621), we get a palindrome (6288778826).

The spelling of 1265163205 in words is "one billion, two hundred sixty-five million, one hundred sixty-three thousand, two hundred five".