68066449920 has 480 divisors, whose sum is σ = 274527107712. Its totient is φ = 15262580736.

The previous prime is 68066449807. The next prime is 68066449939. The reversal of 68066449920 is 2994466086.

It is a tau number, because it is divible by the number of its divisors (480).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8543859 + ... + 8551821.

Almost surely, 2^68066449920 is an apocalyptic number.

68066449920 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 68066449920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137263553856).

68066449920 is an abundant number, since it is smaller than the sum of its proper divisors (206460657792).

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

68066449920 is a wasteful number, since it uses less digits than its factorization.

68066449920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8052 (or 8033 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 54.

The spelling of 68066449920 in words is "sixty-eight billion, sixty-six million, four hundred forty-nine thousand, nine hundred twenty".