266640242 has 16 divisors (see below), whose sum is σ = 455291712. Its totient is φ = 115930320.

The previous prime is 266640233. The next prime is 266640263. The reversal of 266640242 is 242046662.

It is a junction number, because it is equal to n+sod(n) for n = 266640199 and 266640208.

It is an unprimeable number.

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, 262973 + ... + 263984.

It is an arithmetic number, because the mean of its divisors is an integer number (28455732).

Almost surely, 2^266640242 is an apocalyptic number.

266640242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

266640242 is a deficient number, since it is larger than the sum of its proper divisors (188651470).

266640242 is a wasteful number, since it uses less digits than its factorization.

266640242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526993.

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 266640242 is about 16329.1225116355. The cubic root of 266640242 is about 643.6383284222.

The spelling of 266640242 in words is "two hundred sixty-six million, six hundred forty thousand, two hundred forty-two".