266420661 has 32 divisors (see below), whose sum is σ = 401237760. Its totient is φ = 156017664.

The previous prime is 266420639. The next prime is 266420669. The reversal of 266420661 is 166024662.

It is not a de Polignac number, because 266420661 - 2⁵ = 266420629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266420669) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 204765 + ... + 206061.

It is an arithmetic number, because the mean of its divisors is an integer number (12538680).

Almost surely, 2^266420661 is an apocalyptic number.

It is an amenable number.

266420661 is a deficient number, since it is larger than the sum of its proper divisors (134817099).

266420661 is a wasteful number, since it uses less digits than its factorization.

266420661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565.

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 266420661 is about 16322.3975260989. The cubic root of 266420661 is about 643.4615989579.

The spelling of 266420661 in words is "two hundred sixty-six million, four hundred twenty thousand, six hundred sixty-one".