266494145 has 4 divisors (see below), whose sum is σ = 319792980. Its totient is φ = 213195312.

The previous prime is 266494121. The next prime is 266494157. The reversal of 266494145 is 541494662.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 541494662 = 2 ⋅270747331.

It can be written as a sum of positive squares in 2 ways, for example, as 207388801 + 59105344 = 14401^2 + 7688^2 .

It is a cyclic number.

It is not a de Polignac number, because 266494145 - 2²⁰ = 265445569 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26649410 + ... + 26649419.

It is an arithmetic number, because the mean of its divisors is an integer number (79948245).

Almost surely, 2^266494145 is an apocalyptic number.

It is an amenable number.

266494145 is a deficient number, since it is larger than the sum of its proper divisors (53298835).

266494145 is an equidigital number, since it uses as much as digits as its factorization.

266494145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53298834.

The product of its digits is 207360, while the sum is 41.

The square root of 266494145 is about 16324.6483882502. The cubic root of 266494145 is about 643.5207532609.

The spelling of 266494145 in words is "two hundred sixty-six million, four hundred ninety-four thousand, one hundred forty-five".