263664745 has 4 divisors (see below), whose sum is σ = 316397700. Its totient is φ = 210931792.

The previous prime is 263664743. The next prime is 263664763. The reversal of 263664745 is 547466362.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 182898576 + 80766169 = 13524^2 + 8987^2 .

It is a cyclic number.

It is not a de Polignac number, because 263664745 - 2¹ = 263664743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (263664743) 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 in 3 ways as a sum of consecutive naturals, for example, 26366470 + ... + 26366479.

It is an arithmetic number, because the mean of its divisors is an integer number (79099425).

Almost surely, 2^263664745 is an apocalyptic number.

It is an amenable number.

263664745 is a deficient number, since it is larger than the sum of its proper divisors (52732955).

263664745 is an equidigital number, since it uses as much as digits as its factorization.

263664745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52732954.

The product of its digits is 725760, while the sum is 43.

The square root of 263664745 is about 16237.7567724116. The cubic root of 263664745 is about 641.2351999796.

The spelling of 263664745 in words is "two hundred sixty-three million, six hundred sixty-four thousand, seven hundred forty-five".