266145989 has 4 divisors (see below), whose sum is σ = 270509100. Its totient is φ = 261782880.

The previous prime is 266145973. The next prime is 266146003. The reversal of 266145989 is 989541662.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27196225 + 238949764 = 5215^2 + 15458^2 .

It is a cyclic number.

It is not a de Polignac number, because 266145989 - 2⁴ = 266145973 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 (266145589) 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, 2181464 + ... + 2181585.

It is an arithmetic number, because the mean of its divisors is an integer number (67627275).

Almost surely, 2^266145989 is an apocalyptic number.

It is an amenable number.

266145989 is a deficient number, since it is larger than the sum of its proper divisors (4363111).

266145989 is an equidigital number, since it uses as much as digits as its factorization.

266145989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4363110.

The product of its digits is 933120, while the sum is 50.

The square root of 266145989 is about 16313.9813963361. The cubic root of 266145989 is about 643.2403928189.

The spelling of 266145989 in words is "two hundred sixty-six million, one hundred forty-five thousand, nine hundred eighty-nine".