1263665313 has 16 divisors (see below), whose sum is σ = 1898467200. Its totient is φ = 830576880.

The previous prime is 1263665311. The next prime is 1263665341. The reversal of 1263665313 is 3135663621.

1263665313 is a `hidden beast` number, since 1 + 2 + 63 + 66 + 531 + 3 = 666.

It is not a de Polignac number, because 1263665313 - 2¹ = 1263665311 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1263665311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 327678 + ... + 331511.

It is an arithmetic number, because the mean of its divisors is an integer number (118654200).

Almost surely, 2^1263665313 is an apocalyptic number.

It is an amenable number.

1263665313 is a deficient number, since it is larger than the sum of its proper divisors (634801887).

1263665313 is an equidigital number, since it uses as much as digits as its factorization.

1263665313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659269 (or 659263 counting only the distinct ones).

The product of its digits is 58320, while the sum is 36.

The square root of 1263665313 is about 35548.0704539642. The cubic root of 1263665313 is about 1081.1285964442.

The spelling of 1263665313 in words is "one billion, two hundred sixty-three million, six hundred sixty-five thousand, three hundred thirteen".