11565857473 has 4 divisors (see below), whose sum is σ = 11668210308. Its totient is φ = 11463504640.

The previous prime is 11565857467. The next prime is 11565857543. The reversal of 11565857473 is 37475856511.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3536443024 + 8029414449 = 59468^2 + 89607^2 .

It is a cyclic number.

It is not a de Polignac number, because 11565857473 - 2¹⁷ = 11565726401 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11565857473.

It is not an unprimeable number, because it can be changed into a prime (11565857423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51176248 + ... + 51176473.

It is an arithmetic number, because the mean of its divisors is an integer number (2917052577).

Almost surely, 2^11565857473 is an apocalyptic number.

It is an amenable number.

11565857473 is a deficient number, since it is larger than the sum of its proper divisors (102352835).

11565857473 is a wasteful number, since it uses less digits than its factorization.

11565857473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102352834.

The product of its digits is 3528000, while the sum is 52.

The spelling of 11565857473 in words is "eleven billion, five hundred sixty-five million, eight hundred fifty-seven thousand, four hundred seventy-three".