266661356 has 48 divisors (see below), whose sum is σ = 533433600. Its totient is φ = 115697472.

The previous prime is 266661341. The next prime is 266661377. The reversal of 266661356 is 653166662.

It is a happy number.

It is a super-2 number, since 2×266661356² = 142216557567517472, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68675 + ... + 72453.

It is an arithmetic number, because the mean of its divisors is an integer number (11113200).

Almost surely, 2^266661356 is an apocalyptic number.

266661356 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

266661356 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

266661356 is a wasteful number, since it uses less digits than its factorization.

266661356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3878 (or 3876 counting only the distinct ones).

The product of its digits is 233280, while the sum is 41.

The square root of 266661356 is about 16329.7690124508. The cubic root of 266661356 is about 643.6553168818.

The spelling of 266661356 in words is "two hundred sixty-six million, six hundred sixty-one thousand, three hundred fifty-six".