66205533641646 has 16 divisors (see below), whose sum is σ = 151326934038144. Its totient is φ = 18915866754744.

The previous prime is 66205533641633. The next prime is 66205533641669. The reversal of 66205533641646 is 64614633550266.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 788161114740 + ... + 788161114823.

It is an arithmetic number, because the mean of its divisors is an integer number (9457933377384).

Almost surely, 2^{66205533641646} is an apocalyptic number.

66205533641646 is an abundant number, since it is smaller than the sum of its proper divisors (85121400396498).

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

66205533641646 is a wasteful number, since it uses less digits than its factorization.

66205533641646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1576322229575.

The product of its (nonzero) digits is 55987200, while the sum is 57.

The spelling of 66205533641646 in words is "sixty-six trillion, two hundred five billion, five hundred thirty-three million, six hundred forty-one thousand, six hundred forty-six".