266643122 has 4 divisors (see below), whose sum is σ = 399964686. Its totient is φ = 133321560.

The previous prime is 266643109. The next prime is 266643137. The reversal of 266643122 is 221346662.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 221346662 = 2 ⋅110673331.

It can be written as a sum of positive squares in only one way, i.e., 258920281 + 7722841 = 16091^2 + 2779^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66660779 + ... + 66660782.

Almost surely, 2^266643122 is an apocalyptic number.

266643122 is a deficient number, since it is larger than the sum of its proper divisors (133321564).

266643122 is a wasteful number, since it uses less digits than its factorization.

266643122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133321563.

The product of its digits is 20736, while the sum is 32.

The square root of 266643122 is about 16329.2106973975. The cubic root of 266643122 is about 643.6406457414.

Adding to 266643122 its reverse (221346662), we get a palindrome (487989784).

The spelling of 266643122 in words is "two hundred sixty-six million, six hundred forty-three thousand, one hundred twenty-two".