77078000309 has 2 divisors, whose sum is σ = 77078000310. Its totient is φ = 77078000308.

The previous prime is 77078000297. The next prime is 77078000341. The reversal of 77078000309 is 90300087077.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73493583409 + 3584416900 = 271097^2 + 59870^2 .

It is an emirp because it is prime and its reverse (90300087077) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77078000309 - 2²⁰ = 77076951733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77078008309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38539000154 + 38539000155.

It is an arithmetic number, because the mean of its divisors is an integer number (38539000155).

Almost surely, 2^77078000309 is an apocalyptic number.

It is an amenable number.

77078000309 is a deficient number, since it is larger than the sum of its proper divisors (1).

77078000309 is an equidigital number, since it uses as much as digits as its factorization.

77078000309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 74088, while the sum is 41.

The spelling of 77078000309 in words is "seventy-seven billion, seventy-eight million, three hundred nine", and thus it is an aban number.