6660665550101 has 8 divisors (see below), whose sum is σ = 6790935924120. Its totient is φ = 6531449997312.

The previous prime is 6660665550083. The next prime is 6660665550109. The reversal of 6660665550101 is 1010555660666.

It can be written as a sum of positive squares in 4 ways, for example, as 1741700470225 + 4918965079876 = 1319735^2 + 2217874^2 .

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 6660665550101 - 2⁶ = 6660665550037 is a prime.

It is a super-2 number, since 2×6660665550101² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6660665550109) 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, 263692556 + ... + 263717813.

It is an arithmetic number, because the mean of its divisors is an integer number (848866990515).

Almost surely, 2^{6660665550101} is an apocalyptic number.

It is an amenable number.

6660665550101 is a deficient number, since it is larger than the sum of its proper divisors (130270374019).

6660665550101 is a wasteful number, since it uses less digits than its factorization.

6660665550101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527410615.

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

The spelling of 6660665550101 in words is "six trillion, six hundred sixty billion, six hundred sixty-five million, five hundred fifty thousand, one hundred one".