51800551780 has 24 divisors (see below), whose sum is σ = 109779155640. Its totient is φ = 20530126080.

The previous prime is 51800551681. The next prime is 51800551823. The reversal of 51800551780 is 8715500815.

It can be written as a sum of positive squares in 4 ways, for example, as 9864065124 + 41936486656 = 99318^2 + 204784^2 .

It is a super-2 number, since 2×51800551780² (a number of 22 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 11878681 + ... + 11883040.

It is an arithmetic number, because the mean of its divisors is an integer number (4574131485).

Almost surely, 2^51800551780 is an apocalyptic number.

It is an amenable number.

51800551780 is an abundant number, since it is smaller than the sum of its proper divisors (57978603860).

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

51800551780 is a wasteful number, since it uses less digits than its factorization.

51800551780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23761839 (or 23761837 counting only the distinct ones).

The product of its (nonzero) digits is 56000, while the sum is 40.

The spelling of 51800551780 in words is "fifty-one billion, eight hundred million, five hundred fifty-one thousand, seven hundred eighty".