264721563 has 6 divisors (see below), whose sum is σ = 382375604. Its totient is φ = 176481036.

The previous prime is 264721549. The next prime is 264721571. The reversal of 264721563 is 365127462.

264721563 is a `hidden beast` number, since 2 + 647 + 2 + 1 + 5 + 6 + 3 = 666.

It is not a de Polignac number, because 264721563 - 2¹⁰ = 264720539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (264721463) 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 5 ways as a sum of consecutive naturals, for example, 14706745 + ... + 14706762.

Almost surely, 2^264721563 is an apocalyptic number.

264721563 is a deficient number, since it is larger than the sum of its proper divisors (117654041).

264721563 is a wasteful number, since it uses less digits than its factorization.

264721563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29413513 (or 29413510 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 264721563 is about 16270.2662240051. The cubic root of 264721563 is about 642.0907883950.

The spelling of 264721563 in words is "two hundred sixty-four million, seven hundred twenty-one thousand, five hundred sixty-three".