51855744512 has 360 divisors, whose sum is σ = 128621470824. Its totient is φ = 20741529600.

The previous prime is 51855744467. The next prime is 51855744527. The reversal of 51855744512 is 21544755815.

It is a super-4 number, since 4×51855744512⁴ (a number of 44 digits) contains 4444 as substring.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 773966303 + ... + 773966369.

Almost surely, 2^51855744512 is an apocalyptic number.

51855744512 is a gapful number since it is divisible by the number (52) 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 51855744512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64310735412).

51855744512 is an abundant number, since it is smaller than the sum of its proper divisors (76765726312).

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

51855744512 is a wasteful number, since it uses less digits than its factorization.

51855744512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182 (or 124 counting only the distinct ones).

The product of its digits is 1120000, while the sum is 47.

The spelling of 51855744512 in words is "fifty-one billion, eight hundred fifty-five million, seven hundred forty-four thousand, five hundred twelve".