66036510505543 has 8 divisors (see below), whose sum is σ = 67304040559056. Its totient is φ = 64769778902400.

The previous prime is 66036510505519. The next prime is 66036510505549. The reversal of 66036510505543 is 34550501563066.

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 66036510505543 - 2⁴⁵ = 30852138416711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66036510505549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199445593 + ... + 199776418.

It is an arithmetic number, because the mean of its divisors is an integer number (8413005069882).

Almost surely, 2^{66036510505543} is an apocalyptic number.

66036510505543 is a deficient number, since it is larger than the sum of its proper divisors (1267530053513).

66036510505543 is a wasteful number, since it uses less digits than its factorization.

66036510505543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399225185.

The product of its (nonzero) digits is 4860000, while the sum is 49.

The spelling of 66036510505543 in words is "sixty-six trillion, thirty-six billion, five hundred ten million, five hundred five thousand, five hundred forty-three".