266660001 has 6 divisors (see below), whose sum is σ = 385175570. Its totient is φ = 177773328.

The previous prime is 266659961. The next prime is 266660027. The reversal of 266660001 is 100066662.

It can be written as a sum of positive squares in only one way, i.e., 239630400 + 27029601 = 15480^2 + 5199^2 .

It is not a de Polignac number, because 266660001 - 2¹¹ = 266657953 is a prime.

It is a super-2 number, since 2×266660001² = 142215112266640002, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (266660101) 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, 14814436 + ... + 14814453.

Almost surely, 2^266660001 is an apocalyptic number.

It is an amenable number.

266660001 is a deficient number, since it is larger than the sum of its proper divisors (118515569).

266660001 is a wasteful number, since it uses less digits than its factorization.

266660001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29628895 (or 29628892 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 266660001 is about 16329.7275237525. The cubic root of 266660001 is about 643.6542266671.

The spelling of 266660001 in words is "two hundred sixty-six million, six hundred sixty thousand, one".