7778328697 has 2 divisors, whose sum is σ = 7778328698. Its totient is φ = 7778328696.

The previous prime is 7778328689. The next prime is 7778328709. The reversal of 7778328697 is 7968238777.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5670692416 + 2107636281 = 75304^2 + 45909^2 .

It is an emirp because it is prime and its reverse (7968238777) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7778328697 - 2³ = 7778328689 is a prime.

It is not a weakly prime, because it can be changed into another prime (7778328097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3889164348 + 3889164349.

It is an arithmetic number, because the mean of its divisors is an integer number (3889164349).

Almost surely, 2^7778328697 is an apocalyptic number.

It is an amenable number.

7778328697 is a deficient number, since it is larger than the sum of its proper divisors (1).

7778328697 is an equidigital number, since it uses as much as digits as its factorization.

7778328697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49787136, while the sum is 64.

The square root of 7778328697 is about 88194.8337319143. The cubic root of 7778328697 is about 1981.3540967812.

The spelling of 7778328697 in words is "seven billion, seven hundred seventy-eight million, three hundred twenty-eight thousand, six hundred ninety-seven".