66205533641645 has 8 divisors (see below), whose sum is σ = 79459325485056. Its totient is φ = 52955970169936.

The previous prime is 66205533641633. The next prime is 66205533641669. The reversal of 66205533641645 is 54614633550266.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66205533641645 - 2¹⁴ = 66205533625261 is a prime.

It is a super-3 number, since 3×66205533641645³ (a number of 42 digits) contains 333 as substring.

It is a Duffinian number.

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, 1057058477 + ... + 1057121106.

It is an arithmetic number, because the mean of its divisors is an integer number (9932415685632).

Almost surely, 2^{66205533641645} is an apocalyptic number.

It is an amenable number.

66205533641645 is a deficient number, since it is larger than the sum of its proper divisors (13253791843411).

66205533641645 is a wasteful number, since it uses less digits than its factorization.

66205533641645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2114185851.

The product of its (nonzero) digits is 46656000, while the sum is 56.

The spelling of 66205533641645 in words is "sixty-six trillion, two hundred five billion, five hundred thirty-three million, six hundred forty-one thousand, six hundred forty-five".