266238749 has 4 divisors (see below), whose sum is σ = 304272864. Its totient is φ = 228204636.

The previous prime is 266238733. The next prime is 266238761. The reversal of 266238749 is 947832662.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 266238749 - 2⁴ = 266238733 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266238719) 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, 19017047 + ... + 19017060.

It is an arithmetic number, because the mean of its divisors is an integer number (76068216).

Almost surely, 2^266238749 is an apocalyptic number.

It is an amenable number.

266238749 is a deficient number, since it is larger than the sum of its proper divisors (38034115).

266238749 is an equidigital number, since it uses as much as digits as its factorization.

266238749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38034114.

The product of its digits is 870912, while the sum is 47.

The square root of 266238749 is about 16316.8241088761. The cubic root of 266238749 is about 643.3151137749.

The spelling of 266238749 in words is "two hundred sixty-six million, two hundred thirty-eight thousand, seven hundred forty-nine".