261564205230223 has 8 divisors (see below), whose sum is σ = 298930620306560. Its totient is φ = 224197815164760.

The previous prime is 261564205230187. The next prime is 261564205230281. The reversal of 261564205230223 is 322032502465162.

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 261564205230223 - 2¹⁷ = 261564205099151 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261564205230223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261564205230283) 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, 30777568 + ... + 38345626.

It is an arithmetic number, because the mean of its divisors is an integer number (37366327538320).

Almost surely, 2^{261564205230223} is an apocalyptic number.

261564205230223 is a deficient number, since it is larger than the sum of its proper divisors (37366415076337).

261564205230223 is an equidigital number, since it uses as much as digits as its factorization.

261564205230223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12505437.

The product of its (nonzero) digits is 1036800, while the sum is 43.

Adding to 261564205230223 its reverse (322032502465162), we get a palindrome (583596707695385).

The spelling of 261564205230223 in words is "two hundred sixty-one trillion, five hundred sixty-four billion, two hundred five million, two hundred thirty thousand, two hundred twenty-three".