266148665 has 4 divisors (see below), whose sum is σ = 319378404. Its totient is φ = 212918928.

The previous prime is 266148661. The next prime is 266148691. The reversal of 266148665 is 566841662.

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 59105344 + 207043321 = 7688^2 + 14389^2 .

It is a cyclic number.

It is not a de Polignac number, because 266148665 - 2² = 266148661 is a prime.

It is a super-2 number, since 2×266148665² = 141670223762564450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266148661) 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, 26614862 + ... + 26614871.

It is an arithmetic number, because the mean of its divisors is an integer number (79844601).

Almost surely, 2^266148665 is an apocalyptic number.

It is an amenable number.

266148665 is a deficient number, since it is larger than the sum of its proper divisors (53229739).

266148665 is an equidigital number, since it uses as much as digits as its factorization.

266148665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53229738.

The product of its digits is 414720, while the sum is 44.

The square root of 266148665 is about 16314.0634116703. The cubic root of 266148665 is about 643.2425486601.

The spelling of 266148665 in words is "two hundred sixty-six million, one hundred forty-eight thousand, six hundred sixty-five".