266438326901 has 4 divisors (see below), whose sum is σ = 266440325100. Its totient is φ = 266436328704.

The previous prime is 266438326883. The next prime is 266438326907. The reversal of 266438326901 is 109623834662.

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

It can be written as a sum of positive squares in 2 ways, for example, as 56858402500 + 209579924401 = 238450^2 + 457799^2 .

It is a cyclic number.

It is not a de Polignac number, because 266438326901 - 2¹⁴ = 266438310517 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 266438326901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266438326907) 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, 783596 + ... + 1070933.

It is an arithmetic number, because the mean of its divisors is an integer number (66610081275).

Almost surely, 2^266438326901 is an apocalyptic number.

It is an amenable number.

266438326901 is a deficient number, since it is larger than the sum of its proper divisors (1998199).

266438326901 is a wasteful number, since it uses less digits than its factorization.

266438326901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1998198.

The product of its (nonzero) digits is 2239488, while the sum is 50.

The spelling of 266438326901 in words is "two hundred sixty-six billion, four hundred thirty-eight million, three hundred twenty-six thousand, nine hundred one".