1317607665 has 16 divisors (see below), whose sum is σ = 2299824576. Its totient is φ = 638840000.

The previous prime is 1317607639. The next prime is 1317607673. The reversal of 1317607665 is 5667067131.

It is not a de Polignac number, because 1317607665 - 2⁵ = 1317607633 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3992586 + ... + 3992915.

It is an arithmetic number, because the mean of its divisors is an integer number (143739036).

Almost surely, 2^1317607665 is an apocalyptic number.

1317607665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1317607665 is a deficient number, since it is larger than the sum of its proper divisors (982216911).

1317607665 is a wasteful number, since it uses less digits than its factorization.

1317607665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7985520.

The product of its (nonzero) digits is 158760, while the sum is 42.

The square root of 1317607665 is about 36298.8658913746. The cubic root of 1317607665 is about 1096.2982079765.

The spelling of 1317607665 in words is "one billion, three hundred seventeen million, six hundred seven thousand, six hundred sixty-five".