66006610655505 has 64 divisors (see below), whose sum is σ = 120523689877248. Its totient is φ = 30558925946880.

The previous prime is 66006610655473. The next prime is 66006610655507. The reversal of 66006610655505 is 50555601660066.

It is not a de Polignac number, because 66006610655505 - 2⁵ = 66006610655473 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66006610655507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4146211 + ... + 12214920.

It is an arithmetic number, because the mean of its divisors is an integer number (1883182654332).

Almost surely, 2^{66006610655505} is an apocalyptic number.

66006610655505 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66006610655505 is a deficient number, since it is larger than the sum of its proper divisors (54517079221743).

66006610655505 is a wasteful number, since it uses less digits than its factorization.

66006610655505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16362386.

The product of its (nonzero) digits is 4860000, while the sum is 51.

The spelling of 66006610655505 in words is "sixty-six trillion, six billion, six hundred ten million, six hundred fifty-five thousand, five hundred five".