261324535723 has 16 divisors (see below), whose sum is σ = 280254124800. Its totient is φ = 243126051840.

The previous prime is 261324535711. The next prime is 261324535729. The reversal of 261324535723 is 327535423162.

It is not a de Polignac number, because 261324535723 - 2⁵ = 261324535691 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 261324535723.

It is not an unprimeable number, because it can be changed into a prime (261324535729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 414318 + ... + 833251.

It is an arithmetic number, because the mean of its divisors is an integer number (17515882800).

Almost surely, 2^261324535723 is an apocalyptic number.

261324535723 is a deficient number, since it is larger than the sum of its proper divisors (18929589077).

261324535723 is a wasteful number, since it uses less digits than its factorization.

261324535723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247862.

The product of its digits is 907200, while the sum is 43.

Adding to 261324535723 its reverse (327535423162), we get a palindrome (588859958885).

The spelling of 261324535723 in words is "two hundred sixty-one billion, three hundred twenty-four million, five hundred thirty-five thousand, seven hundred twenty-three".