66666236101 has 4 divisors (see below), whose sum is σ = 66666770604. Its totient is φ = 66665701600.

The previous prime is 66666236081. The next prime is 66666236107. The reversal of 66666236101 is 10163266666.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 34271635876 + 32394600225 = 185126^2 + 179985^2 .

It is a cyclic number.

It is not a de Polignac number, because 66666236101 - 2¹⁷ = 66666105029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66666236107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30171 + ... + 366391.

It is an arithmetic number, because the mean of its divisors is an integer number (16666692651).

Almost surely, 2^66666236101 is an apocalyptic number.

It is an amenable number.

66666236101 is a deficient number, since it is larger than the sum of its proper divisors (534503).

66666236101 is a wasteful number, since it uses less digits than its factorization.

66666236101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534502.

The product of its (nonzero) digits is 279936, while the sum is 43.

The spelling of 66666236101 in words is "sixty-six billion, six hundred sixty-six million, two hundred thirty-six thousand, one hundred one".