266148391 has 4 divisors (see below), whose sum is σ = 266275072. Its totient is φ = 266021712.

The previous prime is 266148383. The next prime is 266148397. The reversal of 266148391 is 193841662.

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 266148391 - 2³ = 266148383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266148397) 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 3 ways as a sum of consecutive naturals, for example, 60135 + ... + 64408.

It is an arithmetic number, because the mean of its divisors is an integer number (66568768).

Almost surely, 2^266148391 is an apocalyptic number.

266148391 is a deficient number, since it is larger than the sum of its proper divisors (126681).

266148391 is a wasteful number, since it uses less digits than its factorization.

266148391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126680.

The product of its digits is 62208, while the sum is 40.

The square root of 266148391 is about 16314.0550140056. The cubic root of 266148391 is about 643.2423279207.

The spelling of 266148391 in words is "two hundred sixty-six million, one hundred forty-eight thousand, three hundred ninety-one".