51210071718 has 128 divisors (see below), whose sum is σ = 117451192320. Its totient is φ = 14772226560.

The previous prime is 51210071701. The next prime is 51210071719. The reversal of 51210071718 is 81717001215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51210071719) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13925296 + ... + 13928972.

It is an arithmetic number, because the mean of its divisors is an integer number (917587440).

Almost surely, 2^51210071718 is an apocalyptic number.

51210071718 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 51210071718, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58725596160).

51210071718 is an abundant number, since it is smaller than the sum of its proper divisors (66241120602).

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

51210071718 is a wasteful number, since it uses less digits than its factorization.

51210071718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3902.

The product of its (nonzero) digits is 3920, while the sum is 33.

The spelling of 51210071718 in words is "fifty-one billion, two hundred ten million, seventy-one thousand, seven hundred eighteen".