264550643 has 4 divisors (see below), whose sum is σ = 302343600. Its totient is φ = 226757688.

The previous prime is 264550609. The next prime is 264550679. The reversal of 264550643 is 346055462.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346055462 = 2 ⋅173027731.

It is a cyclic number.

It is not a de Polignac number, because 264550643 - 2²⁶ = 197441779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (264550343) 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, 18896468 + ... + 18896481.

It is an arithmetic number, because the mean of its divisors is an integer number (75585900).

Almost surely, 2^264550643 is an apocalyptic number.

264550643 is a deficient number, since it is larger than the sum of its proper divisors (37792957).

264550643 is an equidigital number, since it uses as much as digits as its factorization.

264550643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37792956.

The product of its (nonzero) digits is 86400, while the sum is 35.

The square root of 264550643 is about 16265.0128496721. The cubic root of 264550643 is about 641.9525679640.

The spelling of 264550643 in words is "two hundred sixty-four million, five hundred fifty thousand, six hundred forty-three".