5181536690513 has 4 divisors (see below), whose sum is σ = 5181738073908. Its totient is φ = 5181335307120.

The previous prime is 5181536690431. The next prime is 5181536690569. The reversal of 5181536690513 is 3150966351815.

It is a happy number.

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 1856632431889 + 3324904258624 = 1362583^2 + 1823432^2 .

It is a cyclic number.

It is not a de Polignac number, because 5181536690513 - 2²⁰ = 5181535641937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5181536690573) 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, 100653098 + ... + 100704563.

It is an arithmetic number, because the mean of its divisors is an integer number (1295434518477).

Almost surely, 2^{5181536690513} is an apocalyptic number.

It is an amenable number.

5181536690513 is a deficient number, since it is larger than the sum of its proper divisors (201383395).

5181536690513 is a wasteful number, since it uses less digits than its factorization.

5181536690513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201383394.

The product of its (nonzero) digits is 2916000, while the sum is 53.

The spelling of 5181536690513 in words is "five trillion, one hundred eighty-one billion, five hundred thirty-six million, six hundred ninety thousand, five hundred thirteen".