5181977659391 has 8 divisors (see below), whose sum is σ = 5580609016080. Its totient is φ = 4783348829952.

The previous prime is 5181977659381. The next prime is 5181977659421. The reversal of 5181977659391 is 1939567791815.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5181977659391 - 2²² = 5181973465087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5181977659381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7576640 + ... + 8232218.

It is an arithmetic number, because the mean of its divisors is an integer number (697576127010).

Almost surely, 2^{5181977659391} is an apocalyptic number.

5181977659391 is a deficient number, since it is larger than the sum of its proper divisors (398631356689).

5181977659391 is a wasteful number, since it uses less digits than its factorization.

5181977659391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1263625.

The product of its digits is 128595600, while the sum is 71.

The spelling of 5181977659391 in words is "five trillion, one hundred eighty-one billion, nine hundred seventy-seven million, six hundred fifty-nine thousand, three hundred ninety-one".