66605041343646 has 128 divisors (see below), whose sum is σ = 164903461632000. Its totient is φ = 19785932788608.

The previous prime is 66605041343629. The next prime is 66605041343663. The reversal of 66605041343646 is 64634314050666.

It is an interprime number because it is at equal distance from previous prime (66605041343629) and next prime (66605041343663).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 66605041343592 and 66605041343601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 354522091 + ... + 354709913.

It is an arithmetic number, because the mean of its divisors is an integer number (1288308294000).

Almost surely, 2^{66605041343646} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66605041343646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82451730816000).

66605041343646 is an abundant number, since it is smaller than the sum of its proper divisors (98298420288354).

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

66605041343646 is a wasteful number, since it uses less digits than its factorization.

66605041343646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205295 (or 205289 counting only the distinct ones).

The product of its (nonzero) digits is 22394880, while the sum is 54.

The spelling of 66605041343646 in words is "sixty-six trillion, six hundred five billion, forty-one million, three hundred forty-three thousand, six hundred forty-six".