66547516897920 has 256 divisors, whose sum is σ = 214259393376000. Its totient is φ = 17567104204800.

The previous prime is 66547516897919. The next prime is 66547516897931. The reversal of 66547516897920 is 2979861574566.

It is a Smith number, since the sum of its digits (75) coincides with the sum of the digits of its prime factors.

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, 1180750701 + ... + 1180807059.

It is an arithmetic number, because the mean of its divisors is an integer number (836950755375).

Almost surely, 2^{66547516897920} is an apocalyptic number.

66547516897920 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 66547516897920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107129696688000).

66547516897920 is an abundant number, since it is smaller than the sum of its proper divisors (147711876478080).

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

66547516897920 is a wasteful number, since it uses less digits than its factorization.

66547516897920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62571 (or 62559 counting only the distinct ones).

The product of its (nonzero) digits is 1371686400, while the sum is 75.

The spelling of 66547516897920 in words is "sixty-six trillion, five hundred forty-seven billion, five hundred sixteen million, eight hundred ninety-seven thousand, nine hundred twenty".