264655415221 has 4 divisors (see below), whose sum is σ = 265181569632. Its totient is φ = 264129260812.

The previous prime is 264655415197. The next prime is 264655415237. The reversal of 264655415221 is 122514556462.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 264655415221 - 2²³ = 264647026613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264655412221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263076451 + ... + 263077456.

It is an arithmetic number, because the mean of its divisors is an integer number (66295392408).

Almost surely, 2^264655415221 is an apocalyptic number.

It is an amenable number.

264655415221 is a deficient number, since it is larger than the sum of its proper divisors (526154411).

264655415221 is an equidigital number, since it uses as much as digits as its factorization.

264655415221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526154410.

The product of its digits is 576000, while the sum is 43.

The spelling of 264655415221 in words is "two hundred sixty-four billion, six hundred fifty-five million, four hundred fifteen thousand, two hundred twenty-one".