266041406302066 has 4 divisors (see below), whose sum is σ = 399062109453102. Its totient is φ = 133020703151032.

The previous prime is 266041406301997. The next prime is 266041406302073. The reversal of 266041406302066 is 660203604140662.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 228334130911441 + 37707275390625 = 15110729^2 + 6140625^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66510351575515 + ... + 66510351575518.

Almost surely, 2^{266041406302066} is an apocalyptic number.

266041406302066 is a deficient number, since it is larger than the sum of its proper divisors (133020703151036).

266041406302066 is a wasteful number, since it uses less digits than its factorization.

266041406302066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133020703151035.

The product of its (nonzero) digits is 1492992, while the sum is 46.

The spelling of 266041406302066 in words is "two hundred sixty-six trillion, forty-one billion, four hundred six million, three hundred two thousand, sixty-six".