66206660266 has 8 divisors (see below), whose sum is σ = 99320050404. Its totient is φ = 33099976800.

The previous prime is 66206660263. The next prime is 66206660279.

66206660266 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 41241080241 + 24965580025 = 203079^2 + 158005^2 .

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

It is not an unprimeable number, because it can be changed into a prime (66206660263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1651915 + ... + 1691518.

Almost surely, 2^66206660266 is an apocalyptic number.

66206660266 is a deficient number, since it is larger than the sum of its proper divisors (33113390138).

66206660266 is a wasteful number, since it uses less digits than its factorization.

66206660266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3353336.

The product of its (nonzero) digits is 1119744, while the sum is 46.

The spelling of 66206660266 in words is "sixty-six billion, two hundred six million, six hundred sixty thousand, two hundred sixty-six".