261663263 has 2 divisors, whose sum is σ = 261663264. Its totient is φ = 261663262.

The previous prime is 261663239. The next prime is 261663277. The reversal of 261663263 is 362366162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261663263 - 2⁸ = 261663007 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261665263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130831631 + 130831632.

It is an arithmetic number, because the mean of its divisors is an integer number (130831632).

Almost surely, 2^261663263 is an apocalyptic number.

261663263 is a deficient number, since it is larger than the sum of its proper divisors (1).

261663263 is an equidigital number, since it uses as much as digits as its factorization.

261663263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 35.

The square root of 261663263 is about 16176.0088711647. The cubic root of 261663263 is about 639.6085358326.

The spelling of 261663263 in words is "two hundred sixty-one million, six hundred sixty-three thousand, two hundred sixty-three".