68555815328 has 432 divisors, whose sum is σ = 192098964960. Its totient is φ = 23775897600.

The previous prime is 68555815309. The next prime is 68555815369. The reversal of 68555815328 is 82351855586.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 84532043 + ... + 84532853.

It is an arithmetic number, because the mean of its divisors is an integer number (444673530).

Almost surely, 2^68555815328 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 68555815328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96049482480).

68555815328 is an abundant number, since it is smaller than the sum of its proper divisors (123543149632).

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

68555815328 is a wasteful number, since it uses less digits than its factorization.

68555815328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901 (or 873 counting only the distinct ones).

The product of its digits is 11520000, while the sum is 56.

The spelling of 68555815328 in words is "sixty-eight billion, five hundred fifty-five million, eight hundred fifteen thousand, three hundred twenty-eight".