264395563 has 2 divisors, whose sum is σ = 264395564. Its totient is φ = 264395562.

The previous prime is 264395531. The next prime is 264395567. The reversal of 264395563 is 365593462.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 264395563 - 2⁵ = 264395531 is a prime.

It is not a weakly prime, because it can be changed into another prime (264395567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132197781 + 132197782.

It is an arithmetic number, because the mean of its divisors is an integer number (132197782).

Almost surely, 2^264395563 is an apocalyptic number.

264395563 is a deficient number, since it is larger than the sum of its proper divisors (1).

264395563 is an equidigital number, since it uses as much as digits as its factorization.

264395563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 583200, while the sum is 43.

The square root of 264395563 is about 16260.2448628549. The cubic root of 264395563 is about 641.8271055795.

The spelling of 264395563 in words is "two hundred sixty-four million, three hundred ninety-five thousand, five hundred sixty-three".