266144981 has 8 divisors (see below), whose sum is σ = 273247128. Its totient is φ = 259072000.

The previous prime is 266144953. The next prime is 266144993. The reversal of 266144981 is 189441662.

It can be written as a sum of positive squares in 4 ways, for example, as 10432900 + 255712081 = 3230^2 + 15991^2 .

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 266144981 - 2¹⁰ = 266143957 is a prime.

It is a super-2 number, since 2×266144981² = 141666301822980722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266144941) 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 7 ways as a sum of consecutive naturals, for example, 11861 + ... + 25941.

It is an arithmetic number, because the mean of its divisors is an integer number (34155891).

Almost surely, 2^266144981 is an apocalyptic number.

It is an amenable number.

266144981 is a deficient number, since it is larger than the sum of its proper divisors (7102147).

266144981 is a wasteful number, since it uses less digits than its factorization.

266144981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14583.

The product of its digits is 82944, while the sum is 41.

The square root of 266144981 is about 16313.9505025607. The cubic root of 266144981 is about 643.2395807493.

The spelling of 266144981 in words is "two hundred sixty-six million, one hundred forty-four thousand, nine hundred eighty-one".