51259239936 has 160 divisors (see below), whose sum is σ = 160656994080. Its totient is φ = 16081256448.

The previous prime is 51259239929. The next prime is 51259239959. The reversal of 51259239936 is 63993295215.

It is a happy number.

51259239936 is a `hidden beast` number, since 5 + 12 + 592 + 3 + 9 + 9 + 36 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 15 ways as a sum of consecutive naturals, for example, 125950 + ... + 344066.

It is an arithmetic number, because the mean of its divisors is an integer number (1004106213).

Almost surely, 2^51259239936 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 51259239936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80328497040).

51259239936 is an abundant number, since it is smaller than the sum of its proper divisors (109397754144).

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

51259239936 is a wasteful number, since it uses less digits than its factorization.

51259239936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218161 (or 218139 counting only the distinct ones).

The product of its digits is 3936600, while the sum is 54.

The spelling of 51259239936 in words is "fifty-one billion, two hundred fifty-nine million, two hundred thirty-nine thousand, nine hundred thirty-six".