263932661 has 2 divisors, whose sum is σ = 263932662. Its totient is φ = 263932660.

The previous prime is 263932649. The next prime is 263932679. The reversal of 263932661 is 166239362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 262764100 + 1168561 = 16210^2 + 1081^2 .

It is a cyclic number.

It is not a de Polignac number, because 263932661 - 2⁶ = 263932597 is a prime.

It is a Chen prime.

It is equal to p_14398805 and since 263932661 and 14398805 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263932681) 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, 131966330 + 131966331.

It is an arithmetic number, because the mean of its divisors is an integer number (131966331).

Almost surely, 2^263932661 is an apocalyptic number.

It is an amenable number.

263932661 is a deficient number, since it is larger than the sum of its proper divisors (1).

263932661 is an equidigital number, since it uses as much as digits as its factorization.

263932661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 38.

The square root of 263932661 is about 16246.0044626363. The cubic root of 263932661 is about 641.4523178877.

The spelling of 263932661 in words is "two hundred sixty-three million, nine hundred thirty-two thousand, six hundred sixty-one".