261646142745323 has 4 divisors (see below), whose sum is σ = 299024163137520. Its totient is φ = 224268122353128.

The previous prime is 261646142745269. The next prime is 261646142745419. The reversal of 261646142745323 is 323547241646162.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 261646142745323 - 2⁸ = 261646142745067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261646142747323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18689010196088 + ... + 18689010196101.

It is an arithmetic number, because the mean of its divisors is an integer number (74756040784380).

Almost surely, 2^{261646142745323} is an apocalyptic number.

261646142745323 is a deficient number, since it is larger than the sum of its proper divisors (37378020392197).

261646142745323 is an equidigital number, since it uses as much as digits as its factorization.

261646142745323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37378020392196.

The product of its digits is 34836480, while the sum is 56.

The spelling of 261646142745323 in words is "two hundred sixty-one trillion, six hundred forty-six billion, one hundred forty-two million, seven hundred forty-five thousand, three hundred twenty-three".