51942254544 has 120 divisors (see below), whose sum is σ = 151912455552. Its totient is φ = 16551521280.

The previous prime is 51942254519. The next prime is 51942254593. The reversal of 51942254544 is 44545224915.

51942254544 is a `hidden beast` number, since 5 + 19 + 42 + 2 + 54 + 544 = 666.

It is a super-2 number, since 2×51942254544² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51942254544.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 201784 + ... + 380264.

Almost surely, 2^51942254544 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 51942254544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75956227776).

51942254544 is an abundant number, since it is smaller than the sum of its proper divisors (99970201008).

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

51942254544 is a wasteful number, since it uses less digits than its factorization.

51942254544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178585 (or 178576 counting only the distinct ones).

The product of its digits is 1152000, while the sum is 45.

The spelling of 51942254544 in words is "fifty-one billion, nine hundred forty-two million, two hundred fifty-four thousand, five hundred forty-four".