1265611053 has 72 divisors (see below), whose sum is σ = 2154756864. Its totient is φ = 658707840.

The previous prime is 1265611027. The next prime is 1265611057. The reversal of 1265611053 is 3501165621.

It is not a de Polignac number, because 1265611053 - 2⁵ = 1265611021 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1265611053.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265611057) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 40826148 + ... + 40826178.

Almost surely, 2^1265611053 is an apocalyptic number.

It is an amenable number.

1265611053 is a deficient number, since it is larger than the sum of its proper divisors (889145811).

1265611053 is an frugal number, since it uses more digits than its factorization.

1265611053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144 (or 58 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 1265611053 is about 35575.4276573030. The cubic root of 1265611053 is about 1081.6832043718.

Adding to 1265611053 its reverse (3501165621), we get a palindrome (4766776674).

The spelling of 1265611053 in words is "one billion, two hundred sixty-five million, six hundred eleven thousand, fifty-three".