266231661 has 8 divisors (see below), whose sum is σ = 355152000. Its totient is φ = 177399552.

The previous prime is 266231639. The next prime is 266231671. The reversal of 266231661 is 166132662.

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

It is not a de Polignac number, because 266231661 - 2¹⁹ = 265707373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266231621) 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, 14661 + ... + 27338.

It is an arithmetic number, because the mean of its divisors is an integer number (44394000).

Almost surely, 2^266231661 is an apocalyptic number.

It is an amenable number.

266231661 is a deficient number, since it is larger than the sum of its proper divisors (88920339).

266231661 is a wasteful number, since it uses less digits than its factorization.

266231661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44115.

The product of its digits is 15552, while the sum is 33.

The square root of 266231661 is about 16316.6069083005. The cubic root of 266231661 is about 643.3094047913.

The spelling of 266231661 in words is "two hundred sixty-six million, two hundred thirty-one thousand, six hundred sixty-one".