66547588518642 has 192 divisors, whose sum is σ = 176157092966400. Its totient is φ = 16373039379840.

The previous prime is 66547588518629. The next prime is 66547588518781. The reversal of 66547588518642 is 24681588574566.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 9275484 + ... + 14803032.

It is an arithmetic number, because the mean of its divisors is an integer number (917484859200).

Almost surely, 2^{66547588518642} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66547588518642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88078546483200).

66547588518642 is an abundant number, since it is smaller than the sum of its proper divisors (109609504447758).

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

66547588518642 is a wasteful number, since it uses less digits than its factorization.

66547588518642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5527709 (or 5527698 counting only the distinct ones).

The product of its digits is 3096576000, while the sum is 75.

The spelling of 66547588518642 in words is "sixty-six trillion, five hundred forty-seven billion, five hundred eighty-eight million, five hundred eighteen thousand, six hundred forty-two".