51394055680 has 320 divisors, whose sum is σ = 142324604928. Its totient is φ = 17615093760.

The previous prime is 51394055659. The next prime is 51394055707. The reversal of 51394055680 is 8655049315.

It is a tau number, because it is divible by the number of its divisors (320).

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a self number, because there is not a number n which added to its sum of digits gives 51394055680.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 47280097 + ... + 47281183.

Almost surely, 2^51394055680 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 51394055680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71162302464).

51394055680 is an abundant number, since it is smaller than the sum of its proper divisors (90930549248).

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

51394055680 is a wasteful number, since it uses less digits than its factorization.

51394055680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1217 (or 1201 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 46.

The spelling of 51394055680 in words is "fifty-one billion, three hundred ninety-four million, fifty-five thousand, six hundred eighty".