261663223 has 8 divisors (see below), whose sum is σ = 271509392. Its totient is φ = 251963136.

The previous prime is 261663217. The next prime is 261663239. The reversal of 261663223 is 322366162.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261663223 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 (261663263) 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, 32865 + ... + 40042.

It is an arithmetic number, because the mean of its divisors is an integer number (33938674).

Almost surely, 2^261663223 is an apocalyptic number.

261663223 is a deficient number, since it is larger than the sum of its proper divisors (9846169).

261663223 is an equidigital number, since it uses as much as digits as its factorization.

261663223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73041.

The product of its digits is 15552, while the sum is 31.

The square root of 261663223 is about 16176.0076347658. The cubic root of 261663223 is about 639.6085032407.

The spelling of 261663223 in words is "two hundred sixty-one million, six hundred sixty-three thousand, two hundred twenty-three".