261166323 has 8 divisors (see below), whose sum is σ = 379878336. Its totient is φ = 158282600.

The previous prime is 261166319. The next prime is 261166361. The reversal of 261166323 is 323661162.

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

It is a cyclic number.

It is not a de Polignac number, because 261166323 - 2² = 261166319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261166303) 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, 3957033 + ... + 3957098.

It is an arithmetic number, because the mean of its divisors is an integer number (47484792).

Almost surely, 2^261166323 is an apocalyptic number.

261166323 is a deficient number, since it is larger than the sum of its proper divisors (118712013).

261166323 is a wasteful number, since it uses less digits than its factorization.

261166323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7914145.

The product of its digits is 7776, while the sum is 30.

The square root of 261166323 is about 16160.6411692111. The cubic root of 261166323 is about 639.2033732473.

The spelling of 261166323 in words is "two hundred sixty-one million, one hundred sixty-six thousand, three hundred twenty-three".