7664128321 has 2 divisors, whose sum is σ = 7664128322. Its totient is φ = 7664128320.

The previous prime is 7664128291. The next prime is 7664128369. The reversal of 7664128321 is 1238214667.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7664127025 + 1296 = 87545^2 + 36^2 .

It is a cyclic number.

It is not a de Polignac number, because 7664128321 - 2¹³ = 7664120129 is a prime.

It is not a weakly prime, because it can be changed into another prime (7664128621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3832064160 + 3832064161.

It is an arithmetic number, because the mean of its divisors is an integer number (3832064161).

Almost surely, 2^7664128321 is an apocalyptic number.

It is an amenable number.

7664128321 is a deficient number, since it is larger than the sum of its proper divisors (1).

7664128321 is an equidigital number, since it uses as much as digits as its factorization.

7664128321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 40.

The square root of 7664128321 is about 87545.0074019073. The cubic root of 7664128321 is about 1971.6095927292.

The spelling of 7664128321 in words is "seven billion, six hundred sixty-four million, one hundred twenty-eight thousand, three hundred twenty-one".