51781579776 has 176 divisors, whose sum is σ = 161424782400. Its totient is φ = 16351911936.

The previous prime is 51781579763. The next prime is 51781579781. The reversal of 51781579776 is 67797518715.

51781579776 is a `hidden beast` number, since 51 + 7 + 8 + 1 + 579 + 7 + 7 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 476026 + ... + 574598.

Almost surely, 2^51781579776 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 51781579776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80712391200).

51781579776 is an abundant number, since it is smaller than the sum of its proper divisors (109643202624).

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

51781579776 is a wasteful number, since it uses less digits than its factorization.

51781579776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98621 (or 98597 counting only the distinct ones).

The product of its digits is 25930800, while the sum is 63.

The spelling of 51781579776 in words is "fifty-one billion, seven hundred eighty-one million, five hundred seventy-nine thousand, seven hundred seventy-six".