266651 has 8 divisors (see below), whose sum is σ = 332544. Its totient is φ = 207720.

The previous prime is 266647. The next prime is 266663. The reversal of 266651 is 156662.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 266651 - 2² = 266647 is a prime.

It is a super-2 number, since 2×266651² = 142205511602, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 266651.

It is not an unprimeable number, because it can be changed into a prime (266641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1655 + ... + 1808.

It is an arithmetic number, because the mean of its divisors is an integer number (41568).

2²⁶⁶⁶⁵¹ is an apocalyptic number.

266651 is a deficient number, since it is larger than the sum of its proper divisors (65893).

266651 is a wasteful number, since it uses less digits than its factorization.

266651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3481.

The product of its digits is 2160, while the sum is 26.

The square root of 266651 is about 516.3826100867. The cubic root of 266651 is about 64.3646984490.

It can be divided in two parts, 266 and 651, that multiplied together give a triangular number (173166 = T₅₈₈).

The spelling of 266651 in words is "two hundred sixty-six thousand, six hundred fifty-one".