51845181696 has 648 divisors, whose sum is σ = 194063181312. Its totient is φ = 13016678400.

The previous prime is 51845181691. The next prime is 51845181697. The reversal of 51845181696 is 69618154815.

51845181696 is a `hidden beast` number, since 51 + 8 + 451 + 81 + 69 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (51845181691) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 60495700 + ... + 60496556.

Almost surely, 2^51845181696 is an apocalyptic number.

51845181696 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 51845181696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97031590656).

51845181696 is an abundant number, since it is smaller than the sum of its proper divisors (142217999616).

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

51845181696 is a wasteful number, since it uses less digits than its factorization.

51845181696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939 (or 911 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 54.

The spelling of 51845181696 in words is "fifty-one billion, eight hundred forty-five million, one hundred eighty-one thousand, six hundred ninety-six".