866544434513 has 4 divisors (see below), whose sum is σ = 866548233060. Its totient is φ = 866540635968.

The previous prime is 866544434423. The next prime is 866544434537. The reversal of 866544434513 is 315434445668.

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 723302622784 + 143241811729 = 850472^2 + 378473^2 .

It is a cyclic number.

It is not a de Polignac number, because 866544434513 - 2³² = 862249467217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866544434573) 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, 1533620 + ... + 2021157.

It is an arithmetic number, because the mean of its divisors is an integer number (216637058265).

Almost surely, 2^866544434513 is an apocalyptic number.

It is an amenable number.

866544434513 is a deficient number, since it is larger than the sum of its proper divisors (3798547).

866544434513 is a wasteful number, since it uses less digits than its factorization.

866544434513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3798546.

The product of its digits is 16588800, while the sum is 53.

The spelling of 866544434513 in words is "eight hundred sixty-six billion, five hundred forty-four million, four hundred thirty-four thousand, five hundred thirteen".