77769385547 has 4 divisors (see below), whose sum is σ = 88879297776. Its totient is φ = 66659473320.

The previous prime is 77769385511. The next prime is 77769385553. The reversal of 77769385547 is 74558396777.

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 77769385547 - 2⁶ = 77769385483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77769385847) 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, 5554956104 + ... + 5554956117.

It is an arithmetic number, because the mean of its divisors is an integer number (22219824444).

Almost surely, 2^77769385547 is an apocalyptic number.

77769385547 is a deficient number, since it is larger than the sum of its proper divisors (11109912229).

77769385547 is a wasteful number, since it uses less digits than its factorization.

77769385547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11109912228.

The product of its digits is 311169600, while the sum is 68.

The spelling of 77769385547 in words is "seventy-seven billion, seven hundred sixty-nine million, three hundred eighty-five thousand, five hundred forty-seven".