51155647488 has 264 divisors, whose sum is σ = 164196682416. Its totient is φ = 15207628800.

The previous prime is 51155647471. The next prime is 51155647511. The reversal of 51155647488 is 88474655115.

51155647488 is a `hidden beast` number, since 5 + 1 + 1 + 5 + 564 + 74 + 8 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (264).

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, 5368168 + ... + 5377688.

Almost surely, 2^51155647488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51155647488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82098341208).

51155647488 is an abundant number, since it is smaller than the sum of its proper divisors (113041034928).

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

51155647488 is a wasteful number, since it uses less digits than its factorization.

51155647488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9611 (or 9590 counting only the distinct ones).

The product of its digits is 5376000, while the sum is 54.

The spelling of 51155647488 in words is "fifty-one billion, one hundred fifty-five million, six hundred forty-seven thousand, four hundred eighty-eight".