51873274656 has 144 divisors (see below), whose sum is σ = 169128820224. Its totient is φ = 14773404672.

The previous prime is 51873274639. The next prime is 51873274657. The reversal of 51873274656 is 65647237815.

51873274656 is a `hidden beast` number, since 518 + 7 + 3 + 2 + 74 + 6 + 56 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is not an unprimeable number, because it can be changed into a prime (51873274657) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 589905 + ... + 672111.

It is an arithmetic number, because the mean of its divisors is an integer number (1174505696).

Almost surely, 2^51873274656 is an apocalyptic number.

51873274656 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 51873274656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84564410112).

51873274656 is an abundant number, since it is smaller than the sum of its proper divisors (117255545568).

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

51873274656 is a wasteful number, since it uses less digits than its factorization.

51873274656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82543 (or 82532 counting only the distinct ones).

The product of its digits is 8467200, while the sum is 54.

The spelling of 51873274656 in words is "fifty-one billion, eight hundred seventy-three million, two hundred seventy-four thousand, six hundred fifty-six".