66106055100665 has 8 divisors (see below), whose sum is σ = 79500848762760. Its totient is φ = 52769122319232.

The previous prime is 66106055100599. The next prime is 66106055100667. The reversal of 66106055100665 is 56600155060166.

It can be written as a sum of positive squares in 4 ways, for example, as 41310545219584 + 24795509881081 = 6427328^2 + 4979509^2 .

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 66106055100665 - 2¹⁶ = 66106055035129 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66106055100667) 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, 14465217650 + ... + 14465222219.

It is an arithmetic number, because the mean of its divisors is an integer number (9937606095345).

Almost surely, 2^{66106055100665} is an apocalyptic number.

It is an amenable number.

66106055100665 is a deficient number, since it is larger than the sum of its proper divisors (13394793662095).

66106055100665 is a wasteful number, since it uses less digits than its factorization.

66106055100665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28930440331.

The product of its (nonzero) digits is 972000, while the sum is 47.

The spelling of 66106055100665 in words is "sixty-six trillion, one hundred six billion, fifty-five million, one hundred thousand, six hundred sixty-five".