51551771544 has 576 divisors, whose sum is σ = 183316573440. Its totient is φ = 13226976000.

The previous prime is 51551771539. The next prime is 51551771561. The reversal of 51551771544 is 44517715515.

51551771544 is a `hidden beast` number, since 5 + 15 + 517 + 71 + 54 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 51551771544.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 205385419 + ... + 205385669.

It is an arithmetic number, because the mean of its divisors is an integer number (318257940).

Almost surely, 2^51551771544 is an apocalyptic number.

51551771544 is a gapful number since it is divisible by the number (54) 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 51551771544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91658286720).

51551771544 is an abundant number, since it is smaller than the sum of its proper divisors (131764801896).

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

51551771544 is a wasteful number, since it uses less digits than its factorization.

51551771544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344 (or 319 counting only the distinct ones).

The product of its digits is 490000, while the sum is 45.

The spelling of 51551771544 in words is "fifty-one billion, five hundred fifty-one million, seven hundred seventy-one thousand, five hundred forty-four".