266830505 has 4 divisors (see below), whose sum is σ = 320196612. Its totient is φ = 213464400.

The previous prime is 266830481. The next prime is 266830517. The reversal of 266830505 is 505038662.

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 167469481 + 99361024 = 12941^2 + 9968^2 .

It is not a de Polignac number, because 266830505 - 2¹² = 266826409 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26683046 + ... + 26683055.

It is an arithmetic number, because the mean of its divisors is an integer number (80049153).

Almost surely, 2^266830505 is an apocalyptic number.

It is an amenable number.

266830505 is a deficient number, since it is larger than the sum of its proper divisors (53366107).

266830505 is an equidigital number, since it uses as much as digits as its factorization.

266830505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53366106.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 266830505 is about 16334.9473522261. The cubic root of 266830505 is about 643.7913828928.

The spelling of 266830505 in words is "two hundred sixty-six million, eight hundred thirty thousand, five hundred five".