51518518078 has 8 divisors (see below), whose sum is σ = 77282227368. Its totient is φ = 25757775624.

The previous prime is 51518518043. The next prime is 51518518091. The reversal of 51518518078 is 87081581515.

It is a happy number.

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

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, 697776 + ... + 768067.

It is an arithmetic number, because the mean of its divisors is an integer number (9660278421).

Almost surely, 2^51518518078 is an apocalyptic number.

51518518078 is a deficient number, since it is larger than the sum of its proper divisors (25763709290).

51518518078 is a wasteful number, since it uses less digits than its factorization.

51518518078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1483418.

The product of its (nonzero) digits is 448000, while the sum is 49.

The spelling of 51518518078 in words is "fifty-one billion, five hundred eighteen million, five hundred eighteen thousand, seventy-eight".