518945742638 has 4 divisors (see below), whose sum is σ = 778418613960. Its totient is φ = 259472871318.

The previous prime is 518945742631. The next prime is 518945742659. The reversal of 518945742638 is 836247549815.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (518945742631) 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 as a sum of consecutive naturals, namely, 129736435658 + ... + 129736435661.

It is an arithmetic number, because the mean of its divisors is an integer number (194604653490).

Almost surely, 2^518945742638 is an apocalyptic number.

518945742638 is a deficient number, since it is larger than the sum of its proper divisors (259472871322).

518945742638 is a wasteful number, since it uses less digits than its factorization.

518945742638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259472871321.

The product of its digits is 58060800, while the sum is 62.

The spelling of 518945742638 in words is "five hundred eighteen billion, nine hundred forty-five million, seven hundred forty-two thousand, six hundred thirty-eight".