266636241 has 9 divisors (see below), whose sum is σ = 385212009. Its totient is φ = 177724836.

The previous prime is 266636233. The next prime is 266636261. The reversal of 266636241 is 142636662.

The square root of 266636241 is 16329.

It is a perfect power (a square), and thus also a powerful number.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 266636241 - 2³ = 266636233 is a prime.

It is a super-2 number, since 2×266636241² = 142189770029220162, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 266636196 and 266636205.

It is not an unprimeable number, because it can be changed into a prime (266636261) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 46266 + ... + 51708.

Almost surely, 2^266636241 is an apocalyptic number.

266636241 is the 16329-th square number.

266636241 is the 8165-th centered octagonal number.

It is an amenable number.

266636241 is a deficient number, since it is larger than the sum of its proper divisors (118575768).

266636241 is an frugal number, since it uses more digits than its factorization.

266636241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10892 (or 5446 counting only the distinct ones).

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

The cubic root of 266636241 is about 643.6351090909.

Multiplying 266636241 by its sum of digits (36), we get a square (9598904676 = 97974²).

The spelling of 266636241 in words is "two hundred sixty-six million, six hundred thirty-six thousand, two hundred forty-one".