261010663 has 2 divisors, whose sum is σ = 261010664. Its totient is φ = 261010662.

The previous prime is 261010649. The next prime is 261010679. The reversal of 261010663 is 366010162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261010663 - 2⁹ = 261010151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261010963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130505331 + 130505332.

It is an arithmetic number, because the mean of its divisors is an integer number (130505332).

Almost surely, 2^261010663 is an apocalyptic number.

261010663 is a deficient number, since it is larger than the sum of its proper divisors (1).

261010663 is an equidigital number, since it uses as much as digits as its factorization.

261010663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 261010663 is about 16155.8244295981. The cubic root of 261010663 is about 639.0763556312.

The spelling of 261010663 in words is "two hundred sixty-one million, ten thousand, six hundred sixty-three".