266606257 has 6 divisors (see below), whose sum is σ = 283211798. Its totient is φ = 250923264.

The previous prime is 266606239. The next prime is 266606273. The reversal of 266606257 is 752606662.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 65221776 + 201384481 = 8076^2 + 14191^2 .

It is not a de Polignac number, because 266606257 - 2¹⁹ = 266081969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266606227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 460968 + ... + 461545.

Almost surely, 2^266606257 is an apocalyptic number.

It is an amenable number.

266606257 is a deficient number, since it is larger than the sum of its proper divisors (16605541).

266606257 is an equidigital number, since it uses as much as digits as its factorization.

266606257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922547 (or 922530 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 266606257 is about 16328.0818530530. The cubic root of 266606257 is about 643.6109819899.

The spelling of 266606257 in words is "two hundred sixty-six million, six hundred six thousand, two hundred fifty-seven".