51338718518 has 8 divisors (see below), whose sum is σ = 77286086112. Its totient is φ = 25576689816.

The previous prime is 51338718493. The next prime is 51338718601. The reversal of 51338718518 is 81581783315.

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

It is a super-2 number, since 2×51338718518² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46334030 + ... + 46335137.

It is an arithmetic number, because the mean of its divisors is an integer number (9660760764).

Almost surely, 2^51338718518 is an apocalyptic number.

51338718518 is a deficient number, since it is larger than the sum of its proper divisors (25947367594).

51338718518 is a wasteful number, since it uses less digits than its factorization.

51338718518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92669446.

The product of its digits is 806400, while the sum is 50.

The spelling of 51338718518 in words is "fifty-one billion, three hundred thirty-eight million, seven hundred eighteen thousand, five hundred eighteen".