266555720047 has 8 divisors (see below), whose sum is σ = 267939118944. Its totient is φ = 265175708928.

The previous prime is 266555720021. The next prime is 266555720069. The reversal of 266555720047 is 740027555662.

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 266555720047 - 2¹⁹ = 266555195759 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 (266555724047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 689098 + ... + 1003975.

It is an arithmetic number, because the mean of its divisors is an integer number (33492389868).

Almost surely, 2^266555720047 is an apocalyptic number.

266555720047 is a deficient number, since it is larger than the sum of its proper divisors (1383398897).

266555720047 is a wasteful number, since it uses less digits than its factorization.

266555720047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1693889.

The product of its (nonzero) digits is 3528000, while the sum is 49.

The spelling of 266555720047 in words is "two hundred sixty-six billion, five hundred fifty-five million, seven hundred twenty thousand, forty-seven".