266621045236243 has 4 divisors (see below), whose sum is σ = 266621320743048. Its totient is φ = 266620769729440.

The previous prime is 266621045236223. The next prime is 266621045236279. The reversal of 266621045236243 is 342632540126662.

It is a happy number.

266621045236243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 266621045236243 - 2¹³ = 266621045228051 is a prime.

It is a super-2 number, since 2×266621045236243² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266621045236223) 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, 136296646 + ... + 138238987.

It is an arithmetic number, because the mean of its divisors is an integer number (66655330185762).

Almost surely, 2^{266621045236243} is an apocalyptic number.

266621045236243 is a deficient number, since it is larger than the sum of its proper divisors (275506805).

266621045236243 is an equidigital number, since it uses as much as digits as its factorization.

266621045236243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275506804.

The product of its (nonzero) digits is 14929920, while the sum is 52.

The spelling of 266621045236243 in words is "two hundred sixty-six trillion, six hundred twenty-one billion, forty-five million, two hundred thirty-six thousand, two hundred forty-three".