266248641 has 4 divisors (see below), whose sum is σ = 354998192. Its totient is φ = 177499092.

The previous prime is 266248639. The next prime is 266248649. The reversal of 266248641 is 146842662.

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 not a de Polignac number, because 266248641 - 2¹ = 266248639 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 266248641.

It is not an unprimeable number, because it can be changed into a prime (266248649) 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, 44374771 + ... + 44374776.

It is an arithmetic number, because the mean of its divisors is an integer number (88749548).

Almost surely, 2^266248641 is an apocalyptic number.

It is an amenable number.

266248641 is a deficient number, since it is larger than the sum of its proper divisors (88749551).

266248641 is an equidigital number, since it uses as much as digits as its factorization.

266248641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88749550.

The product of its digits is 110592, while the sum is 39.

The square root of 266248641 is about 16317.1272287741. The cubic root of 266248641 is about 643.3230810528.

The spelling of 266248641 in words is "two hundred sixty-six million, two hundred forty-eight thousand, six hundred forty-one".