261252138730323 has 16 divisors (see below), whose sum is σ = 379650930059520. Its totient is φ = 158833552367904.

The previous prime is 261252138730301. The next prime is 261252138730409. The reversal of 261252138730323 is 323037831252162.

261252138730323 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 261252138730323 - 2²⁵ = 261252105175891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261252138730423) 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, 40354049703 + ... + 40354056176.

It is an arithmetic number, because the mean of its divisors is an integer number (23728183128720).

Almost surely, 2^{261252138730323} is an apocalyptic number.

261252138730323 is a deficient number, since it is larger than the sum of its proper divisors (118398791329197).

261252138730323 is a wasteful number, since it uses less digits than its factorization.

261252138730323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80708105978.

The product of its (nonzero) digits is 2177280, while the sum is 48.

Adding to 261252138730323 its reverse (323037831252162), we get a palindrome (584289969982485).

The spelling of 261252138730323 in words is "two hundred sixty-one trillion, two hundred fifty-two billion, one hundred thirty-eight million, seven hundred thirty thousand, three hundred twenty-three".