7665788729 has 2 divisors, whose sum is σ = 7665788730. Its totient is φ = 7665788728.

The previous prime is 7665788671. The next prime is 7665788789. The reversal of 7665788729 is 9278875667.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4805678329 + 2860110400 = 69323^2 + 53480^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7665788729 is a prime.

It is not a weakly prime, because it can be changed into another prime (7665788789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3832894364 + 3832894365.

It is an arithmetic number, because the mean of its divisors is an integer number (3832894365).

Almost surely, 2^7665788729 is an apocalyptic number.

It is an amenable number.

7665788729 is a deficient number, since it is larger than the sum of its proper divisors (1).

7665788729 is an equidigital number, since it uses as much as digits as its factorization.

7665788729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 71124480, while the sum is 65.

The square root of 7665788729 is about 87554.4900561930. The cubic root of 7665788729 is about 1971.7519633430.

The spelling of 7665788729 in words is "seven billion, six hundred sixty-five million, seven hundred eighty-eight thousand, seven hundred twenty-nine".