261461659189 has 2 divisors, whose sum is σ = 261461659190. Its totient is φ = 261461659188.

The previous prime is 261461659187. The next prime is 261461659253. The reversal of 261461659189 is 981956164162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 261282500964 + 179158225 = 511158^2 + 13385^2 .

It is a cyclic number.

It is not a de Polignac number, because 261461659189 - 2¹ = 261461659187 is a prime.

Together with 261461659187, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261461659187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130730829594 + 130730829595.

It is an arithmetic number, because the mean of its divisors is an integer number (130730829595).

Almost surely, 2^261461659189 is an apocalyptic number.

It is an amenable number.

261461659189 is a deficient number, since it is larger than the sum of its proper divisors (1).

261461659189 is an equidigital number, since it uses as much as digits as its factorization.

261461659189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5598720, while the sum is 58.

The spelling of 261461659189 in words is "two hundred sixty-one billion, four hundred sixty-one million, six hundred fifty-nine thousand, one hundred eighty-nine".