77383347509 has 4 divisors (see below), whose sum is σ = 83335912716. Its totient is φ = 71430782304.

The previous prime is 77383347463. The next prime is 77383347539. The reversal of 77383347509 is 90574338377.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31973016100 + 45410331409 = 178810^2 + 213097^2 .

It is a cyclic number.

It is not a de Polignac number, because 77383347509 - 2²⁰ = 77382298933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77383347539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2976282584 + ... + 2976282609.

It is an arithmetic number, because the mean of its divisors is an integer number (20833978179).

Almost surely, 2^77383347509 is an apocalyptic number.

It is an amenable number.

77383347509 is a deficient number, since it is larger than the sum of its proper divisors (5952565207).

77383347509 is a wasteful number, since it uses less digits than its factorization.

77383347509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5952565206.

The product of its (nonzero) digits is 13335840, while the sum is 56.

The spelling of 77383347509 in words is "seventy-seven billion, three hundred eighty-three million, three hundred forty-seven thousand, five hundred nine".