68543921454920 has 128 divisors (see below), whose sum is σ = 161268336771840. Its totient is φ = 26170261877760.

The previous prime is 68543921454919. The next prime is 68543921454949. The reversal of 68543921454920 is 2945412934586.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2019485150 + ... + 2019519090.

It is an arithmetic number, because the mean of its divisors is an integer number (1259908881030).

Almost surely, 2^{68543921454920} 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 68543921454920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80634168385920).

68543921454920 is an abundant number, since it is smaller than the sum of its proper divisors (92724415316920).

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

68543921454920 is a wasteful number, since it uses less digits than its factorization.

68543921454920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38535 (or 38531 counting only the distinct ones).

The product of its (nonzero) digits is 74649600, while the sum is 62.

The spelling of 68543921454920 in words is "sixty-eight trillion, five hundred forty-three billion, nine hundred twenty-one million, four hundred fifty-four thousand, nine hundred twenty".