263557663 has 2 divisors, whose sum is σ = 263557664. Its totient is φ = 263557662.

The previous prime is 263557603. The next prime is 263557673. The reversal of 263557663 is 366755362.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 263557663 - 2¹³ = 263549471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263557603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131778831 + 131778832.

It is an arithmetic number, because the mean of its divisors is an integer number (131778832).

Almost surely, 2^263557663 is an apocalyptic number.

263557663 is a deficient number, since it is larger than the sum of its proper divisors (1).

263557663 is an equidigital number, since it uses as much as digits as its factorization.

263557663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 680400, while the sum is 43.

The square root of 263557663 is about 16234.4591224962. The cubic root of 263557663 is about 641.1483800733.

The spelling of 263557663 in words is "two hundred sixty-three million, five hundred fifty-seven thousand, six hundred sixty-three".