518787432361 has 9 divisors (see below), whose sum is σ = 570246134493. Its totient is φ = 471617735820.

The previous prime is 518787432313. The next prime is 518787432367. The reversal of 518787432361 is 163234787815.

The square root of 518787432361 is 720269.

It is a perfect power (a square), and thus also a powerful number.

It is a de Polignac number, because none of the positive numbers 2^k-518787432361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (518787432367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7890220 + ... + 7955698.

Almost surely, 2^518787432361 is an apocalyptic number.

518787432361 is the 720269-th square number.

518787432361 is the 360135-th centered octagonal number.

It is an amenable number.

518787432361 is a deficient number, since it is larger than the sum of its proper divisors (51458702132).

518787432361 is an frugal number, since it uses more digits than its factorization.

518787432361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130980 (or 65490 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 55.

The spelling of 518787432361 in words is "five hundred eighteen billion, seven hundred eighty-seven million, four hundred thirty-two thousand, three hundred sixty-one".