51873722568 has 80 divisors (see below), whose sum is σ = 145550839500. Its totient is φ = 17260729344.

The previous prime is 51873722567. The next prime is 51873722569. The reversal of 51873722568 is 86522737815.

51873722568 is a `hidden beast` number, since 5 + 1 + 8 + 7 + 3 + 72 + 2 + 568 = 666.

It is an interprime number because it is at equal distance from previous prime (51873722567) and next prime (51873722569).

It can be written as a sum of positive squares in 2 ways, for example, as 50067642564 + 1806080004 = 223758^2 + 42498^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (51873722567) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 298368 + ... + 439056.

Almost surely, 2^51873722568 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 51873722568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72775419750).

51873722568 is an abundant number, since it is smaller than the sum of its proper divisors (93677116932).

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

51873722568 is a wasteful number, since it uses less digits than its factorization.

51873722568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141276 (or 141263 counting only the distinct ones).

The product of its digits is 5644800, while the sum is 54.

The spelling of 51873722568 in words is "fifty-one billion, eight hundred seventy-three million, seven hundred twenty-two thousand, five hundred sixty-eight".