66510565555 has 8 divisors (see below), whose sum is σ = 91214489952. Its totient is φ = 45607244928.

The previous prime is 66510565529. The next prime is 66510565573. The reversal of 66510565555 is 55556501566.

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

It is not a de Polignac number, because 66510565555 - 2⁵ = 66510565523 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66510565499 and 66510565508.

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, 950150902 + ... + 950150971.

It is an arithmetic number, because the mean of its divisors is an integer number (11401811244).

Almost surely, 2^66510565555 is an apocalyptic number.

66510565555 is a deficient number, since it is larger than the sum of its proper divisors (24703924397).

66510565555 is a wasteful number, since it uses less digits than its factorization.

66510565555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1900301885.

The product of its (nonzero) digits is 3375000, while the sum is 49.

The spelling of 66510565555 in words is "sixty-six billion, five hundred ten million, five hundred sixty-five thousand, five hundred fifty-five".