51551554400000 has 216 divisors, whose sum is σ = 129025309976640. Its totient is φ = 20555471360000.

The previous prime is 51551554399991. The next prime is 51551554400029. The reversal of 51551554400000 is 445515515.

It is a super-2 number, since 2×51551554400000² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 253498361 + ... + 253701639.

It is an arithmetic number, because the mean of its divisors is an integer number (597339398040).

Almost surely, 2^{51551554400000} is an apocalyptic number.

51551554400000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51551554400000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64512654988320).

51551554400000 is an abundant number, since it is smaller than the sum of its proper divisors (77473755576640).

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

51551554400000 is an frugal number, since it uses more digits than its factorization.

51551554400000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203637 (or 203603 counting only the distinct ones).

The product of its (nonzero) digits is 50000, while the sum is 35.

Adding to 51551554400000 its reverse (445515515), we get a palindrome (51551999915515).

The spelling of 51551554400000 in words is "fifty-one trillion, five hundred fifty-one billion, five hundred fifty-four million, four hundred thousand".