51895505142 has 64 divisors (see below), whose sum is σ = 125017105920. Its totient is φ = 15862068000.

The previous prime is 51895505113. The next prime is 51895505149. The reversal of 51895505142 is 24150559815.

51895505142 is a `hidden beast` number, since 5 + 1 + 8 + 9 + 550 + 51 + 42 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51895505149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 138784 + ... + 350787.

It is an arithmetic number, because the mean of its divisors is an integer number (1953392280).

Almost surely, 2^51895505142 is an apocalyptic number.

51895505142 is an abundant number, since it is smaller than the sum of its proper divisors (73121600778).

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

51895505142 is a wasteful number, since it uses less digits than its factorization.

51895505142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489746 (or 489740 counting only the distinct ones).

The product of its (nonzero) digits is 360000, while the sum is 45.

The spelling of 51895505142 in words is "fifty-one billion, eight hundred ninety-five million, five hundred five thousand, one hundred forty-two".