51817426272 has 120 divisors (see below), whose sum is σ = 152690092632. Its totient is φ = 17238873600.

The previous prime is 51817426267. The next prime is 51817426273. The reversal of 51817426272 is 27262471815.

51817426272 is a `hidden beast` number, since 5 + 1 + 8 + 17 + 4 + 2 + 627 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51817426273) 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, 1331247 + ... + 1369617.

Almost surely, 2^51817426272 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 51817426272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76345046316).

51817426272 is an abundant number, since it is smaller than the sum of its proper divisors (100872666360).

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

51817426272 is a wasteful number, since it uses less digits than its factorization.

51817426272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38914 (or 38897 counting only the distinct ones).

The product of its digits is 376320, while the sum is 45.

It can be divided in two parts, 518174 and 26272, that added together give a triangular number (544446 = T₁₀₄₃).

The spelling of 51817426272 in words is "fifty-one billion, eight hundred seventeen million, four hundred twenty-six thousand, two hundred seventy-two".