5181977659393 has 4 divisors (see below), whose sum is σ = 5194286395348. Its totient is φ = 5169668923440.

The previous prime is 5181977659381. The next prime is 5181977659421. The reversal of 5181977659393 is 3939567791815.

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 565117538049 + 4616860121344 = 751743^2 + 2148688^2 .

It is a cyclic number.

It is not a de Polignac number, because 5181977659393 - 2³³ = 5173387724801 is a prime.

It is a super-2 number, since 2×5181977659393² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5181977659333) 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, 6154367346 + ... + 6154368187.

It is an arithmetic number, because the mean of its divisors is an integer number (1298571598837).

Almost surely, 2^{5181977659393} is an apocalyptic number.

It is an amenable number.

5181977659393 is a deficient number, since it is larger than the sum of its proper divisors (12308735955).

5181977659393 is a wasteful number, since it uses less digits than its factorization.

5181977659393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12308735954.

The product of its digits is 385786800, while the sum is 73.

The spelling of 5181977659393 in words is "five trillion, one hundred eighty-one billion, nine hundred seventy-seven million, six hundred fifty-nine thousand, three hundred ninety-three".