66550665655 has 8 divisors (see below), whose sum is σ = 80115946992. Its totient is φ = 53070433728.

The previous prime is 66550665653. The next prime is 66550665691. The reversal of 66550665655 is 55656605566.

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 66550665655 - 2¹ = 66550665653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66550665596 and 66550665605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66550665653) 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, 21260629 + ... + 21263758.

It is an arithmetic number, because the mean of its divisors is an integer number (10014493374).

Almost surely, 2^66550665655 is an apocalyptic number.

66550665655 is a deficient number, since it is larger than the sum of its proper divisors (13565281337).

66550665655 is a wasteful number, since it uses less digits than its factorization.

66550665655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42524705.

The product of its (nonzero) digits is 24300000, while the sum is 55.

The spelling of 66550665655 in words is "sixty-six billion, five hundred fifty million, six hundred sixty-five thousand, six hundred fifty-five".