51556703616 has 192 divisors, whose sum is σ = 165796197840. Its totient is φ = 15242035200.

The previous prime is 51556703609. The next prime is 51556703621. The reversal of 51556703616 is 61630765515.

51556703616 is a `hidden beast` number, since 51 + 5 + 567 + 0 + 36 + 1 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 469936 + ... + 569168.

Almost surely, 2^51556703616 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 51556703616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82898098920).

51556703616 is an abundant number, since it is smaller than the sum of its proper divisors (114239494224).

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

51556703616 is a wasteful number, since it uses less digits than its factorization.

51556703616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99305 (or 99290 counting only the distinct ones).

The product of its (nonzero) digits is 567000, while the sum is 45.

The spelling of 51556703616 in words is "fifty-one billion, five hundred fifty-six million, seven hundred three thousand, six hundred sixteen".