1316565645651 has 24 divisors (see below), whose sum is σ = 1949297628096. Its totient is φ = 855771596160.

The previous prime is 1316565645649. The next prime is 1316565645721. The reversal of 1316565645651 is 1565465656131.

1316565645651 is a `hidden beast` number, since 1 + 3 + 16 + 5 + 6 + 5 + 64 + 565 + 1 = 666.

It is not a de Polignac number, because 1316565645651 - 2¹ = 1316565645649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1316565645641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 510795 + ... + 1701188.

It is an arithmetic number, because the mean of its divisors is an integer number (81220734504).

Almost surely, 2^{1316565645651} is an apocalyptic number.

1316565645651 is a deficient number, since it is larger than the sum of its proper divisors (632731982445).

1316565645651 is a wasteful number, since it uses less digits than its factorization.

1316565645651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2213643 (or 2213640 counting only the distinct ones).

The product of its digits is 9720000, while the sum is 54.

The spelling of 1316565645651 in words is "one trillion, three hundred sixteen billion, five hundred sixty-five million, six hundred forty-five thousand, six hundred fifty-one".