266128651 has 4 divisors (see below), whose sum is σ = 267242400. Its totient is φ = 265014904.

The previous prime is 266128613. The next prime is 266128669. The reversal of 266128651 is 156821662.

266128651 = 215² + 216² + ... + 931².

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 266128651 - 2⁹ = 266128139 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 266128651.

It is not an unprimeable number, because it can be changed into a prime (266128151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 556516 + ... + 556993.

It is an arithmetic number, because the mean of its divisors is an integer number (66810600).

Almost surely, 2^266128651 is an apocalyptic number.

266128651 is a deficient number, since it is larger than the sum of its proper divisors (1113749).

266128651 is a wasteful number, since it uses less digits than its factorization.

266128651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1113748.

The product of its digits is 34560, while the sum is 37.

The square root of 266128651 is about 16313.4500029883. The cubic root of 266128651 is about 643.2264246152.

The spelling of 266128651 in words is "two hundred sixty-six million, one hundred twenty-eight thousand, six hundred fifty-one".