77772427777 has 6 divisors (see below), whose sum is σ = 85485395954. Its totient is φ = 70702206960.

The previous prime is 77772427717. The next prime is 77772427793.

77772427777 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 75510093681 + 2262334096 = 274791^2 + 47564^2 .

It is not a de Polignac number, because 77772427777 - 2¹¹ = 77772425729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77772427717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 321373548 + ... + 321373789.

Almost surely, 2^77772427777 is an apocalyptic number.

It is an amenable number.

77772427777 is a deficient number, since it is larger than the sum of its proper divisors (7712968177).

77772427777 is a wasteful number, since it uses less digits than its factorization.

77772427777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642747359 (or 642747348 counting only the distinct ones).

The product of its digits is 92236816, while the sum is 64.

The spelling of 77772427777 in words is "seventy-seven billion, seven hundred seventy-two million, four hundred twenty-seven thousand, seven hundred seventy-seven".