77561327747 has 4 divisors (see below), whose sum is σ = 80235856320. Its totient is φ = 74886799176.

The previous prime is 77561327699. The next prime is 77561327771. The reversal of 77561327747 is 74772316577.

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

It is a cyclic number.

It is not a de Polignac number, because 77561327747 - 2¹⁰ = 77561326723 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77561327692 and 77561327701.

It is not an unprimeable number, because it can be changed into a prime (77561326747) 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, 1337264243 + ... + 1337264300.

It is an arithmetic number, because the mean of its divisors is an integer number (20058964080).

Almost surely, 2^77561327747 is an apocalyptic number.

77561327747 is a deficient number, since it is larger than the sum of its proper divisors (2674528573).

77561327747 is a wasteful number, since it uses less digits than its factorization.

77561327747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2674528572.

The product of its digits is 12101040, while the sum is 56.

The spelling of 77561327747 in words is "seventy-seven billion, five hundred sixty-one million, three hundred twenty-seven thousand, seven hundred forty-seven".