77830730209 has 2 divisors, whose sum is σ = 77830730210. Its totient is φ = 77830730208.

The previous prime is 77830730191. The next prime is 77830730291. The reversal of 77830730209 is 90203703877.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68983446609 + 8847283600 = 262647^2 + 94060^2 .

It is a cyclic number.

It is not a de Polignac number, because 77830730209 - 2¹¹ = 77830728161 is a prime.

It is a super-2 number, since 2×77830730209² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77830736209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38915365104 + 38915365105.

It is an arithmetic number, because the mean of its divisors is an integer number (38915365105).

Almost surely, 2^77830730209 is an apocalyptic number.

It is an amenable number.

77830730209 is a deficient number, since it is larger than the sum of its proper divisors (1).

77830730209 is an equidigital number, since it uses as much as digits as its factorization.

77830730209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 444528, while the sum is 46.

The spelling of 77830730209 in words is "seventy-seven billion, eight hundred thirty million, seven hundred thirty thousand, two hundred nine".