12864452081 has 4 divisors (see below), whose sum is σ = 13854025332. Its totient is φ = 11874878832.

The previous prime is 12864452063. The next prime is 12864452093. The reversal of 12864452081 is 18025446821.

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 8211984400 + 4652467681 = 90620^2 + 68209^2 .

It is a cyclic number.

It is not a de Polignac number, because 12864452081 - 2⁶ = 12864452017 is a prime.

It is a super-2 number, since 2×12864452081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12864452021) 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, 494786606 + ... + 494786631.

It is an arithmetic number, because the mean of its divisors is an integer number (3463506333).

Almost surely, 2^12864452081 is an apocalyptic number.

It is an amenable number.

12864452081 is a deficient number, since it is larger than the sum of its proper divisors (989573251).

12864452081 is an equidigital number, since it uses as much as digits as its factorization.

12864452081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989573250.

The product of its (nonzero) digits is 122880, while the sum is 41.

The spelling of 12864452081 in words is "twelve billion, eight hundred sixty-four million, four hundred fifty-two thousand, eighty-one".