261161263567 has 2 divisors, whose sum is σ = 261161263568. Its totient is φ = 261161263566.

The previous prime is 261161263523. The next prime is 261161263579. The reversal of 261161263567 is 765362161162.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261161263567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261161263367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130580631783 + 130580631784.

It is an arithmetic number, because the mean of its divisors is an integer number (130580631784).

Almost surely, 2^261161263567 is an apocalyptic number.

261161263567 is a deficient number, since it is larger than the sum of its proper divisors (1).

261161263567 is an equidigital number, since it uses as much as digits as its factorization.

261161263567 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 46.

The spelling of 261161263567 in words is "two hundred sixty-one billion, one hundred sixty-one million, two hundred sixty-three thousand, five hundred sixty-seven".