261080500289 has 4 divisors (see below), whose sum is σ = 298377714624. Its totient is φ = 223783285956.

The previous prime is 261080500283. The next prime is 261080500301. The reversal of 261080500289 is 982005080162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261080500289 - 2⁸ = 261080500033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261080500283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18648607157 + ... + 18648607170.

It is an arithmetic number, because the mean of its divisors is an integer number (74594428656).

Almost surely, 2^261080500289 is an apocalyptic number.

It is an amenable number.

261080500289 is a deficient number, since it is larger than the sum of its proper divisors (37297214335).

261080500289 is an equidigital number, since it uses as much as digits as its factorization.

261080500289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37297214334.

The product of its (nonzero) digits is 69120, while the sum is 41.

The spelling of 261080500289 in words is "two hundred sixty-one billion, eighty million, five hundred thousand, two hundred eighty-nine".