51006680388 has 144 divisors (see below), whose sum is σ = 145143363456. Its totient is φ = 15017333760.

The previous prime is 51006680381. The next prime is 51006680519. The reversal of 51006680388 is 88308660015.

It is not an unprimeable number, because it can be changed into a prime (51006680381) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 711843 + ... + 780213.

It is an arithmetic number, because the mean of its divisors is an integer number (1007940024).

Almost surely, 2^51006680388 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 51006680388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72571681728).

51006680388 is an abundant number, since it is smaller than the sum of its proper divisors (94136683068).

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

51006680388 is a wasteful number, since it uses less digits than its factorization.

51006680388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68474 (or 68469 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 51006680388 in words is "fifty-one billion, six million, six hundred eighty thousand, three hundred eighty-eight".