264740061221 has 4 divisors (see below), whose sum is σ = 265643611212. Its totient is φ = 263836511232.

The previous prime is 264740061217. The next prime is 264740061293. The reversal of 264740061221 is 122160047462.

It is a happy number.

264740061221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 239953022500 + 24787038721 = 489850^2 + 157439^2 .

It is a cyclic number.

It is not a de Polignac number, because 264740061221 - 2² = 264740061217 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 (264740066221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 451774556 + ... + 451775141.

It is an arithmetic number, because the mean of its divisors is an integer number (66410902803).

Almost surely, 2^264740061221 is an apocalyptic number.

It is an amenable number.

264740061221 is a deficient number, since it is larger than the sum of its proper divisors (903549991).

264740061221 is an equidigital number, since it uses as much as digits as its factorization.

264740061221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 903549990.

The product of its (nonzero) digits is 32256, while the sum is 35.

The spelling of 264740061221 in words is "two hundred sixty-four billion, seven hundred forty million, sixty-one thousand, two hundred twenty-one".