266920661 has 16 divisors (see below), whose sum is σ = 316846080. Its totient is φ = 220110000.

The previous prime is 266920649. The next prime is 266920673. The reversal of 266920661 is 166029662.

It is an interprime number because it is at equal distance from previous prime (266920649) and next prime (266920673).

It is a cyclic number.

It is not a de Polignac number, because 266920661 - 2¹⁰ = 266919637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266920061) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 12536 + ... + 26286.

It is an arithmetic number, because the mean of its divisors is an integer number (19802880).

Almost surely, 2^266920661 is an apocalyptic number.

It is an amenable number.

266920661 is a deficient number, since it is larger than the sum of its proper divisors (49925419).

266920661 is a wasteful number, since it uses less digits than its factorization.

266920661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13864.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 266920661 is about 16337.7067240173. The cubic root of 266920661 is about 643.8638822499.

The spelling of 266920661 in words is "two hundred sixty-six million, nine hundred twenty thousand, six hundred sixty-one".