266721722 has 4 divisors (see below), whose sum is σ = 400082586. Its totient is φ = 133360860.

The previous prime is 266721701. The next prime is 266721727. The reversal of 266721722 is 227127662.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 227127662 = 2 ⋅113563831.

It can be written as a sum of positive squares in only one way, i.e., 147889921 + 118831801 = 12161^2 + 10901^2 .

It is a super-2 number, since 2×266721722² = 142280953973290568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (266721727) by changing a digit.

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 as a sum of consecutive naturals, namely, 66680429 + ... + 66680432.

Almost surely, 2^266721722 is an apocalyptic number.

266721722 is a deficient number, since it is larger than the sum of its proper divisors (133360864).

266721722 is a wasteful number, since it uses less digits than its factorization.

266721722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133360863.

The product of its digits is 28224, while the sum is 35.

The square root of 266721722 is about 16331.6172499848. The cubic root of 266721722 is about 643.7038828056.

It can be divided in two parts, 2667 and 21722, that added together give a cube (24389 = 29³).

The spelling of 266721722 in words is "two hundred sixty-six million, seven hundred twenty-one thousand, seven hundred twenty-two".