7642008709 has 2 divisors, whose sum is σ = 7642008710. Its totient is φ = 7642008708.

The previous prime is 7642008643. The next prime is 7642008721. The reversal of 7642008709 is 9078002467.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7335408609 + 306600100 = 85647^2 + 17510^2 .

It is an emirp because it is prime and its reverse (9078002467) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7642008709 - 2¹⁵ = 7641975941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7642008769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3821004354 + 3821004355.

It is an arithmetic number, because the mean of its divisors is an integer number (3821004355).

Almost surely, 2^7642008709 is an apocalyptic number.

It is an amenable number.

7642008709 is a deficient number, since it is larger than the sum of its proper divisors (1).

7642008709 is an equidigital number, since it uses as much as digits as its factorization.

7642008709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 7642008709 is about 87418.5833161348. The cubic root of 7642008709 is about 1969.7109961952.

The spelling of 7642008709 in words is "seven billion, six hundred forty-two million, eight thousand, seven hundred nine".