266366421 has 32 divisors (see below), whose sum is σ = 432259200. Its totient is φ = 161360640.

The previous prime is 266366417. The next prime is 266366423. The reversal of 266366421 is 124663662.

266366421 is a `hidden beast` number, since 2 + 6 + 6 + 3 + 6 + 642 + 1 = 666.

It is not a de Polignac number, because 266366421 - 2² = 266366417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266366423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3306 + ... + 23316.

It is an arithmetic number, because the mean of its divisors is an integer number (13508100).

Almost surely, 2^266366421 is an apocalyptic number.

It is an amenable number.

266366421 is a deficient number, since it is larger than the sum of its proper divisors (165892779).

266366421 is a wasteful number, since it uses less digits than its factorization.

266366421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20066 (or 20060 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The square root of 266366421 is about 16320.7359209075. The cubic root of 266366421 is about 643.4179290141.

The spelling of 266366421 in words is "two hundred sixty-six million, three hundred sixty-six thousand, four hundred twenty-one".