518261874649 has 4 divisors (see below), whose sum is σ = 545538815440. Its totient is φ = 490984933860.

The previous prime is 518261874629. The next prime is 518261874653. The reversal of 518261874649 is 946478162815.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 518261874649 - 2¹⁹ = 518261350361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (518261874619) 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, 13638470367 + ... + 13638470404.

It is an arithmetic number, because the mean of its divisors is an integer number (136384703860).

Almost surely, 2^518261874649 is an apocalyptic number.

It is an amenable number.

518261874649 is a deficient number, since it is larger than the sum of its proper divisors (27276940791).

518261874649 is a wasteful number, since it uses less digits than its factorization.

518261874649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27276940790.

The product of its digits is 23224320, while the sum is 61.

The spelling of 518261874649 in words is "five hundred eighteen billion, two hundred sixty-one million, eight hundred seventy-four thousand, six hundred forty-nine".