11544857809 has 9 divisors (see below), whose sum is σ = 11643574683. Its totient is φ = 11446973592.

The previous prime is 11544857789. The next prime is 11544857833. The reversal of 11544857809 is 90875844511.

The square root of 11544857809 is 107447.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 734681025 + 10810176784 = 27105^2 + 103972^2 .

It is a de Polignac number, because none of the positive numbers 2^k-11544857809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11544857869) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 14934747 + ... + 14935519.

Almost surely, 2^11544857809 is an apocalyptic number.

11544857809 is the 107447-th square number.

11544857809 is the 53724-th centered octagonal number.

It is an amenable number.

11544857809 is a deficient number, since it is larger than the sum of its proper divisors (98716874).

11544857809 is an frugal number, since it uses more digits than its factorization.

11544857809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1824 (or 912 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 52.

The spelling of 11544857809 in words is "eleven billion, five hundred forty-four million, eight hundred fifty-seven thousand, eight hundred nine".