263538673 has 2 divisors, whose sum is σ = 263538674. Its totient is φ = 263538672.

The previous prime is 263538661. The next prime is 263538703. The reversal of 263538673 is 376835362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 261371889 + 2166784 = 16167^2 + 1472^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-263538673 is a prime.

It is not a weakly prime, because it can be changed into another prime (263538773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131769336 + 131769337.

It is an arithmetic number, because the mean of its divisors is an integer number (131769337).

Almost surely, 2^263538673 is an apocalyptic number.

It is an amenable number.

263538673 is a deficient number, since it is larger than the sum of its proper divisors (1).

263538673 is an equidigital number, since it uses as much as digits as its factorization.

263538673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 43.

The square root of 263538673 is about 16233.8742449238. The cubic root of 263538673 is about 641.1329809129.

The spelling of 263538673 in words is "two hundred sixty-three million, five hundred thirty-eight thousand, six hundred seventy-three".