11565451645 has 64 divisors (see below), whose sum is σ = 16294390272. Its totient is φ = 7852416000.

The previous prime is 11565451643. The next prime is 11565451661. The reversal of 11565451645 is 54615456511.

It is not a de Polignac number, because 11565451645 - 2¹ = 11565451643 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11565451643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17083047 + ... + 17083723.

It is an arithmetic number, because the mean of its divisors is an integer number (254599848).

Almost surely, 2^11565451645 is an apocalyptic number.

It is an amenable number.

11565451645 is a deficient number, since it is larger than the sum of its proper divisors (4728938627).

11565451645 is a wasteful number, since it uses less digits than its factorization.

11565451645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883 (or 861 counting only the distinct ones).

The product of its digits is 360000, while the sum is 43.

The spelling of 11565451645 in words is "eleven billion, five hundred sixty-five million, four hundred fifty-one thousand, six hundred forty-five".