51818063550 has 48 divisors (see below), whose sum is σ = 140191420032. Its totient is φ = 12561954400.

The previous prime is 51818063543. The next prime is 51818063573. The reversal of 51818063550 is 5536081815.

It is a super-2 number, since 2×51818063550² (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 (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15700794 + ... + 15704093.

It is an arithmetic number, because the mean of its divisors is an integer number (2920654584).

Almost surely, 2^51818063550 is an apocalyptic number.

51818063550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51818063550 is an abundant number, since it is smaller than the sum of its proper divisors (88373356482).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51818063550 is a wasteful number, since it uses less digits than its factorization.

51818063550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31404913 (or 31404908 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 42.

The spelling of 51818063550 in words is "fifty-one billion, eight hundred eighteen million, sixty-three thousand, five hundred fifty".