7664128369 has 2 divisors, whose sum is σ = 7664128370. Its totient is φ = 7664128368.

The previous prime is 7664128321. The next prime is 7664128387. The reversal of 7664128369 is 9638214667.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5496294769 + 2167833600 = 74137^2 + 46560^2 .

It is an emirp because it is prime and its reverse (9638214667) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7664128369 is a prime.

It is a super-2 number, since 2×7664128369² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7664128399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3832064184 + 3832064185.

It is an arithmetic number, because the mean of its divisors is an integer number (3832064185).

Almost surely, 2^7664128369 is an apocalyptic number.

It is an amenable number.

7664128369 is a deficient number, since it is larger than the sum of its proper divisors (1).

7664128369 is an equidigital number, since it uses as much as digits as its factorization.

7664128369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 52.

The square root of 7664128369 is about 87545.0076760520. The cubic root of 7664128369 is about 1971.6095968452.

The spelling of 7664128369 in words is "seven billion, six hundred sixty-four million, one hundred twenty-eight thousand, three hundred sixty-nine".