261801673571 has 2 divisors, whose sum is σ = 261801673572. Its totient is φ = 261801673570.

The previous prime is 261801673489. The next prime is 261801673583. The reversal of 261801673571 is 175376108162.

261801673571 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261801673571 - 2²² = 261797479267 is a prime.

It is not a weakly prime, because it can be changed into another prime (261801273571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130900836785 + 130900836786.

It is an arithmetic number, because the mean of its divisors is an integer number (130900836786).

Almost surely, 2^261801673571 is an apocalyptic number.

261801673571 is a deficient number, since it is larger than the sum of its proper divisors (1).

261801673571 is an equidigital number, since it uses as much as digits as its factorization.

261801673571 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 423360, while the sum is 47.

The spelling of 261801673571 in words is "two hundred sixty-one billion, eight hundred one million, six hundred seventy-three thousand, five hundred seventy-one".