66320981424420 has 96 divisors (see below), whose sum is σ = 188144702968320. Its totient is φ = 17452873950720.

The previous prime is 66320981424413. The next prime is 66320981424437. The reversal of 66320981424420 is 2442418902366.

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, 5806210 + ... + 12897830.

It is an arithmetic number, because the mean of its divisors is an integer number (1959840655920).

Almost surely, 2^{66320981424420} is an apocalyptic number.

66320981424420 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 66320981424420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94072351484160).

66320981424420 is an abundant number, since it is smaller than the sum of its proper divisors (121823721543900).

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

66320981424420 is a wasteful number, since it uses less digits than its factorization.

66320981424420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7093685 (or 7093683 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 51.

The spelling of 66320981424420 in words is "sixty-six trillion, three hundred twenty billion, nine hundred eighty-one million, four hundred twenty-four thousand, four hundred twenty".