266479991089 has 9 divisors (see below), whose sum is σ = 288562523553. Its totient is φ = 245975335632.

The previous prime is 266479991069. The next prime is 266479991111. The reversal of 266479991089 is 980199974662.

The square root of 266479991089 is 516217.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 2275767025 + 264204224064 = 47705^2 + 514008^2 .

It is a de Polignac number, because none of the positive numbers 2^k-266479991089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266479991039) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6690967 + ... + 6730675.

It is an arithmetic number, because the mean of its divisors is an integer number (32062502617).

Almost surely, 2^266479991089 is an apocalyptic number.

266479991089 is the 516217-th square number.

266479991089 is the 258109-th centered octagonal number.

It is an amenable number.

266479991089 is a deficient number, since it is larger than the sum of its proper divisors (22082532464).

266479991089 is an frugal number, since it uses more digits than its factorization.

266479991089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79444 (or 39722 counting only the distinct ones).

The product of its (nonzero) digits is 105815808, while the sum is 70.

The spelling of 266479991089 in words is "two hundred sixty-six billion, four hundred seventy-nine million, nine hundred ninety-one thousand, eighty-nine".