266806661 has 8 divisors (see below), whose sum is σ = 291900000. Its totient is φ = 241853040.

The previous prime is 266806649. The next prime is 266806681. The reversal of 266806661 is 166608662.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 266806661 - 2⁶ = 266806597 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 (266806681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30911 + ... + 38588.

It is an arithmetic number, because the mean of its divisors is an integer number (36487500).

Almost surely, 2^266806661 is an apocalyptic number.

It is an amenable number.

266806661 is a deficient number, since it is larger than the sum of its proper divisors (25093339).

266806661 is a wasteful number, since it uses less digits than its factorization.

266806661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69859.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 266806661 is about 16334.2174896749. The cubic root of 266806661 is about 643.7722059013.

The spelling of 266806661 in words is "two hundred sixty-six million, eight hundred six thousand, six hundred sixty-one".