266301640 has 48 divisors (see below), whose sum is σ = 658613340. Its totient is φ = 96835200.

The previous prime is 266301631. The next prime is 266301649. The reversal of 266301640 is 46103662.

It is an interprime number because it is at equal distance from previous prime (266301631) and next prime (266301649).

It can be written as a sum of positive squares in 2 ways, for example, as 257217444 + 9084196 = 16038^2 + 3014^2 .

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 266301599 and 266301608.

It is not an unprimeable number, because it can be changed into a prime (266301649) 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 11 ways as a sum of consecutive naturals, for example, 22671 + ... + 32350.

Almost surely, 2^266301640 is an apocalyptic number.

266301640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266301640 is an abundant number, since it is smaller than the sum of its proper divisors (392311700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

266301640 is a wasteful number, since it uses less digits than its factorization.

266301640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55054 (or 55039 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 266301640 is about 16318.7511777096. The cubic root of 266301640 is about 643.3657644856.

The spelling of 266301640 in words is "two hundred sixty-six million, three hundred one thousand, six hundred forty".