518973278405 has 4 divisors (see below), whose sum is σ = 622767934092. Its totient is φ = 415178622720.

The previous prime is 518973278347. The next prime is 518973278441. The reversal of 518973278405 is 504872379815.

It is a Cunningham number, because it is equal to 720398²+1.

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 186829688644 + 332143589761 = 432238^2 + 576319^2 .

It is not a de Polignac number, because 518973278405 - 2¹⁶ = 518973212869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51897327836 + ... + 51897327845.

It is an arithmetic number, because the mean of its divisors is an integer number (155691983523).

Almost surely, 2^518973278405 is an apocalyptic number.

It is an amenable number.

518973278405 is a deficient number, since it is larger than the sum of its proper divisors (103794655687).

518973278405 is a wasteful number, since it uses less digits than its factorization.

518973278405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103794655686.

The product of its (nonzero) digits is 16934400, while the sum is 59.

The spelling of 518973278405 in words is "five hundred eighteen billion, nine hundred seventy-three million, two hundred seventy-eight thousand, four hundred five".