263640323 has 2 divisors, whose sum is σ = 263640324. Its totient is φ = 263640322.

The previous prime is 263640319. The next prime is 263640331. The reversal of 263640323 is 323046362.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 263640323 - 2² = 263640319 is a prime.

It is not a weakly prime, because it can be changed into another prime (263640313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131820161 + 131820162.

It is an arithmetic number, because the mean of its divisors is an integer number (131820162).

Almost surely, 2^263640323 is an apocalyptic number.

263640323 is a deficient number, since it is larger than the sum of its proper divisors (1).

263640323 is an equidigital number, since it uses as much as digits as its factorization.

263640323 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 29.

The square root of 263640323 is about 16237.0047422547. The cubic root of 263640323 is about 641.2154011886.

Adding to 263640323 its reverse (323046362), we get a palindrome (586686685).

The spelling of 263640323 in words is "two hundred sixty-three million, six hundred forty thousand, three hundred twenty-three".