51020543142 has 64 divisors (see below), whose sum is σ = 114983712000. Its totient is φ = 16767656640.

The previous prime is 51020543111. The next prime is 51020543153. The reversal of 51020543142 is 24134502015.

51020543142 is a `hidden beast` number, since 5 + 102 + 0 + 543 + 14 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1198234 + ... + 1240082.

It is an arithmetic number, because the mean of its divisors is an integer number (1796620500).

Almost surely, 2^51020543142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51020543142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57491856000).

51020543142 is an abundant number, since it is smaller than the sum of its proper divisors (63963168858).

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

51020543142 is a wasteful number, since it uses less digits than its factorization.

51020543142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42178 (or 42172 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The spelling of 51020543142 in words is "fifty-one billion, twenty million, five hundred forty-three thousand, one hundred forty-two".