68051715840 has 540 divisors, whose sum is σ = 251978143032. Its totient is φ = 17536020480.

The previous prime is 68051715793. The next prime is 68051715847. The reversal of 68051715840 is 4851715086.

68051715840 is a `hidden beast` number, since 6 + 80 + 517 + 1 + 58 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (540).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68051715847) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 99636139 + ... + 99636821.

Almost surely, 2^68051715840 is an apocalyptic number.

68051715840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68051715840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125989071516).

68051715840 is an abundant number, since it is smaller than the sum of its proper divisors (183926427192).

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

68051715840 is an equidigital number, since it uses as much as digits as its factorization.

68051715840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778 (or 724 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 45.

The spelling of 68051715840 in words is "sixty-eight billion, fifty-one million, seven hundred fifteen thousand, eight hundred forty".