51338951040 has 256 divisors, whose sum is σ = 176666676480. Its totient is φ = 12606038016.

The previous prime is 51338951023. The next prime is 51338951047. The reversal of 51338951040 is 4015983315.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 51338951040.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51338951047) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11054959 + ... + 11059601.

It is an arithmetic number, because the mean of its divisors is an integer number (690104205).

Almost surely, 2^51338951040 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 51338951040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88333338240).

51338951040 is an abundant number, since it is smaller than the sum of its proper divisors (125327725440).

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

51338951040 is a wasteful number, since it uses less digits than its factorization.

51338951040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5121 (or 5109 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 39.

The spelling of 51338951040 in words is "fifty-one billion, three hundred thirty-eight million, nine hundred fifty-one thousand, forty".