77117315549 has 16 divisors (see below), whose sum is σ = 82887112704. Its totient is φ = 71571654000.

The previous prime is 77117315479. The next prime is 77117315579. The reversal of 77117315549 is 94551371177.

It is a cyclic number.

It is not a de Polignac number, because 77117315549 - 2²⁰ = 77116266973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77117315497 and 77117315506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77117315579) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108857 + ... + 407534.

It is an arithmetic number, because the mean of its divisors is an integer number (5180444544).

Almost surely, 2^77117315549 is an apocalyptic number.

It is an amenable number.

77117315549 is a deficient number, since it is larger than the sum of its proper divisors (5769797155).

77117315549 is a wasteful number, since it uses less digits than its factorization.

77117315549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516608.

The product of its digits is 926100, while the sum is 50.

The spelling of 77117315549 in words is "seventy-seven billion, one hundred seventeen million, three hundred fifteen thousand, five hundred forty-nine".