266652981 has 24 divisors (see below), whose sum is σ = 440697920. Its totient is φ = 152197056.

The previous prime is 266652977. The next prime is 266653027. The reversal of 266652981 is 189256662.

It is not a de Polignac number, because 266652981 - 2² = 266652977 is a prime.

It is a super-2 number, since 2×266652981² = 142207624552372722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266652901) 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 23 ways as a sum of consecutive naturals, for example, 68865 + ... + 72633.

Almost surely, 2^266652981 is an apocalyptic number.

266652981 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

266652981 is a deficient number, since it is larger than the sum of its proper divisors (174044939).

266652981 is a wasteful number, since it uses less digits than its factorization.

266652981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4905 (or 4902 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 266652981 is about 16329.5125769265. The cubic root of 266652981 is about 643.6485784105.

It can be divided in two parts, 26665 and 2981, that added together give a triangular number (29646 = T₂₄₃).

The spelling of 266652981 in words is "two hundred sixty-six million, six hundred fifty-two thousand, nine hundred eighty-one".