266660495 has 4 divisors (see below), whose sum is σ = 319992600. Its totient is φ = 213328392.

The previous prime is 266660489. The next prime is 266660531. The reversal of 266660495 is 594066662.

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 266660495 - 2⁴ = 266660479 is a prime.

It is a super-2 number, since 2×266660495² = 142215639187290050, which contains 22 as substring.

It is a congruent 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, 26666045 + ... + 26666054.

It is an arithmetic number, because the mean of its divisors is an integer number (79998150).

Almost surely, 2^266660495 is an apocalyptic number.

266660495 is a deficient number, since it is larger than the sum of its proper divisors (53332105).

266660495 is an equidigital number, since it uses as much as digits as its factorization.

266660495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53332104.

The product of its (nonzero) digits is 466560, while the sum is 44.

The square root of 266660495 is about 16329.7426495337. The cubic root of 266660495 is about 643.6546241332.

The spelling of 266660495 in words is "two hundred sixty-six million, six hundred sixty thousand, four hundred ninety-five".