1316216565 has 24 divisors (see below), whose sum is σ = 2295985848. Its totient is φ = 697507200.

The previous prime is 1316216501. The next prime is 1316216609. The reversal of 1316216565 is 5656126131.

1316216565 is a `hidden beast` number, since 1 + 31 + 62 + 1 + 6 + 565 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 48358116 + 1267858449 = 6954^2 + 35607^2 .

It is not a de Polignac number, because 1316216565 - 2⁶ = 1316216501 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 86086 + ... + 100215.

It is an arithmetic number, because the mean of its divisors is an integer number (95666077).

Almost surely, 2^1316216565 is an apocalyptic number.

1316216565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1316216565 is a deficient number, since it is larger than the sum of its proper divisors (979769283).

1316216565 is a wasteful number, since it uses less digits than its factorization.

1316216565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186469 (or 186466 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 1316216565 is about 36279.6990753782. The cubic root of 1316216565 is about 1095.9122566041.

The spelling of 1316216565 in words is "one billion, three hundred sixteen million, two hundred sixteen thousand, five hundred sixty-five".