1263265065 has 80 divisors (see below), whose sum is σ = 2399517120. Its totient is φ = 634055040.

The previous prime is 1263265049. The next prime is 1263265067. The reversal of 1263265065 is 5605623621.

It is a happy number.

1263265065 is a `hidden beast` number, since 12 + 632 + 6 + 5 + 0 + 6 + 5 = 666.

It is not a de Polignac number, because 1263265065 - 2⁴ = 1263265049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1263265067) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1392342 + ... + 1393248.

It is an arithmetic number, because the mean of its divisors is an integer number (29993964).

Almost surely, 2^1263265065 is an apocalyptic number.

1263265065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1263265065 is a deficient number, since it is larger than the sum of its proper divisors (1136252055).

1263265065 is a wasteful number, since it uses less digits than its factorization.

1263265065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1124 (or 1115 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 1263265065 is about 35542.4403354637. The cubic root of 1263265065 is about 1081.0144403598.

Adding to 1263265065 its reverse (5605623621), we get a palindrome (6868888686).

The spelling of 1263265065 in words is "one billion, two hundred sixty-three million, two hundred sixty-five thousand, sixty-five".