51653581056 has 432 divisors, whose sum is σ = 193767275520. Its totient is φ = 12832174080.

The previous prime is 51653581003. The next prime is 51653581073. The reversal of 51653581056 is 65018535615.

51653581056 is a `hidden beast` number, since 5 + 1 + 6 + 535 + 8 + 105 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4074055 + ... + 4086713.

It is an arithmetic number, because the mean of its divisors is an integer number (448535360).

Almost surely, 2^51653581056 is an apocalyptic number.

51653581056 is a gapful number since it is divisible by the number (56) 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 51653581056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96883637760).

51653581056 is an abundant number, since it is smaller than the sum of its proper divisors (142113694464).

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

51653581056 is a wasteful number, since it uses less digits than its factorization.

51653581056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12722 (or 12705 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 45.

The spelling of 51653581056 in words is "fifty-one billion, six hundred fifty-three million, five hundred eighty-one thousand, fifty-six".